What is polycrystalline water?
Переглядів 183,637
День томуEpisode 2 of my series on water ice! Admittedly this is probably the least interesting because it's some negative results, but it's not very scientific to only discuss successes right? In this video, I use a lens to melt ice from the inside out, exposing it's polycrystalline structure (and explain how it's different from a single crystal). With this partially-melted ice, I can do a bit of materials forensics, and actually figure out how it formed, hopefully so I can improve the process in the future!
Next video will be on vapor growth, and I'll say right now that it DOES work to grow centimeters-big faceted single crystals! Subscribe to make sure you see it!
CORRECTIONS:
[none yet!]
Other videos in this series:
The Sound of Freezing, Explained!
• The Sound of Freezing:...
The Sound of Freezing (Bonus Footage)
• The Sound of Freezing:...
What is polycrystalline water?
• What is polycrystallin...
Check out the other social media for updates and ramblings:
/ alphaphoenixchannel
/ alpha__phoenix
/ tryitagain
Interesting articles for the extra-curious:
J.M. Adams, W. Lewis, The Production of Large Single Crystals of Ice, Rev. Sci. Instrum. 5 (1934) 400-402. doi:10.1063/1.1751759.
T. Shichiri, Faceted ice crystals grown in water without air, J. Cryst. Growth. 187 (1998) 133-137. doi:10.1016/S0022-0248(97)00839-7.
P. Bisson, H. Groenzin, I.L. Barnett, M.J. Shultz, High yield, single crystal ice via the Bridgman method, Rev. Sci. Instrum. 87 (2016) 034103. doi:10.1063/1.4944481.
A. Cahoon, M. Maruyama, J.S. Wettlaufer, Growth-Melt Asymmetry in Crystals and Twelve-Sided Snowflakes, Phys. Rev. Lett. 96 (2006) 255502. doi:10.1103/PhysRevLett.96.255502.
T. Gonda, The Growth of Small Ice Crystals in Gases of High and Low Pressures, C, J. Meteorol. Soc. Japan. Ser. II. 55 (1977) 142-146. doi:10.2151/jmsj1965.55.1_142.
Y. Furukawa, S. Kohata, Temperature dependence of the growth form of negative crystal in an ice single crystal and evaporation kinetics for its surfaces, J. Cryst. Growth. 129 (1993) 571-581. doi:10.1016/0022-0248(93)90493-G.
N.N. Khusnatdinov, V.F. Petrenko, Fast-growth technique for ice single crystals, J. Cryst. Growth. 163 (1996) 420-425. doi:10.1016/0022-0248(95)00980-9.
D. v. d. S. Roos, Rapid Production of Single Crystals of Ice, J. Glaciol. 14 (1975) 325-328. doi:10.3189/s0022143000021808.
Example of "single crystal casting" through a corkscrew shaped crucible for turbine blades 040b.synthasite.com/resources/...
#Materials #Physics #Crystals
Music and images in this video:
I Dunno by grapes is licensed under a Creative Commons Attribution license (creativecommons.org/licenses/...)
ccmixter.org/files/grapes/16626
en.wikipedia.org/wiki/Bridgma...
en.wikipedia.org/wiki/Snowfla...
@leovalenzuela8368 2 роки тому
"showing only the successes and not the failures isnt very scientific" subscribed on the spot.
@r0cketplumber Рік тому
Plan A always goes up in flames.
@leovalenzuela8368 Рік тому
@@r0cketplumber haha yes, very true
@happyundertaker6255 3 роки тому
Hexagons are the bestagons.
@AlphaPhoenixChannel 3 роки тому
Indeed. I saw that video a few weeks ago then proceeded to watch every main Gray video I could find...
@stefanheimersheim 3 роки тому
Only outmatched by Hexaflexagons :-) [see Vihart's videos]
@awesomefeldmanfamily 3 роки тому
@@stefanheimersheim ah yes, a classic
@raziasultana5222 2 роки тому
Yes cgp grey makes the bestahexagons.
@Tepalus 2 роки тому
200th like, take it or leave it :D
@fastedeverything8555 2 роки тому
"this is ice" The crow in the background: "thanks captain obvious!"
@lootgodamn5721 2 роки тому
" that is a loud bird "
@kasai7272 2 роки тому
The timing was so good I thought it was editing at first
@ravenna6543 2 роки тому
@@kasai7272 Same
@xarin42 3 роки тому
The failures really are important and interesting too. I wish more channels showed them.
@Laralinda 3 роки тому
I wish more scientific researchers showed them too!
@ericlotze7724 3 роки тому
@@Laralinda But replicating results, or having failed studies doesn't get you g r a n t s...
@battlesheep2552 2 роки тому
In science, you only fail if you don't learn anything
@DreStyle 2 роки тому
They are, you don't need to see what makes it good, but bad.. In that way it's easy to understand the process
@krumplethemal8831 Рік тому
You mean like the Dude Perfect guys who lead their audience into believing they get the first attempt at a trick shot on the first try. When it probably took a hundred if not, more attempts but they always edit out the fails..
@user-zn4pw5nk2v 2 роки тому
"that's a loud bird", no it's either a crow or a raven,the humble loudbird died when we stopped naming animals by description.
@koniginator 2 роки тому
The anteater begs to differ
@nomsterdude 2 роки тому
😔
@nomsterdude 2 роки тому
@@koniginator The anteaters just built different
@miss-sagemoon 2 роки тому
does this mean big bird is an endangered species?
@user-zn4pw5nk2v 2 роки тому
@@miss-sagemoon yes! (That was a joke, as is this)
@pyromen321 3 роки тому
Awesome video! Seeing the actual grain boundaries in ice was really cool! I’m excited to see your vapor deposition process!
@samykamkar 3 роки тому
Super cool video! Thanks for sharing.
@Jakub1989YTb 3 роки тому
Supercooled video!
@AlphaPhoenixChannel 3 роки тому
Ba dum tss
@Trooopetre 3 роки тому
Watching this video my brain was screaming about using vapor deposition. Living somewhere it is currently negative 25C, I have massive crystals like that growing on every vent of the house.
@bdf2718 2 роки тому
Sounds almost like molecular beam epitaxy. I wonder where we can find somebody who knows about that.
@Jeremyak Місяць тому
I know it's getting cold where I live when I get frost developing on every screw and nail head that leads to an exterior wall. And one of the most beautiful sights you'll ever see is the massive hoar frost crystals that grow during a particularly long cold snap. 🌨
@themightyripples6582 2 роки тому
You're quickly becoming my favourite YT scientist. Thank you for your work.
@kleinesfilmroellchen 2 роки тому
A long time ago I made a presentation about crystalline symmetry and taxonomy. And even though I forgot everything, I still jump out in joy every time I read something like the P6cm or m3m (I hope that's a thing).
@sophiegrey9576 2 роки тому
"This is ice" finally, something I can understand
@SimulatingPhysics 3 роки тому
Hi! I came from the Physics subreddit. I really liked your demonstrations. What is the size of the grains showed at 4:48? I mean, how much zoom is the photo?
@AlphaPhoenixChannel 3 роки тому
most of the columnar grains from the zoom-in are on the order of 1-5 mm across. I was using the kit 50mm sony lens with a macro tube for a bit closer focus. At the edges of the "boule" there are some large grains, like one entire side that was pushed against the edge of the container was a grain, but it wasn't very thick, and as you get closer to the middle it gets messier. The edges probably nucleated by themselves early and some of them got big before colliding
@SimulatingPhysics 3 роки тому
@@AlphaPhoenixChannel Thank you for the detailed answer!
@peteoconnor6388 3 роки тому
Came over from Steve Moulds channel and I'm so glad I did!
@IanGrams 3 роки тому
I've always wanted to learn more about material science, thank you for sharing your knowledge of it! I've been hooked ever since that amazing bubble demo. Also thank you for sharing the things that didn't work. Totally agree that's an important part of science.
@AlphaPhoenixChannel 3 роки тому
It's a fantastic field at the intersection of so many others!
@IanGrams 3 роки тому
@@AlphaPhoenixChannel much agreed! I'm especially interested in all the cool stuff going on with 2d materials like magic angle graphene and this work I saw back in October: www.sciencedaily.com/releases/2020/10/201012115949.htm The TL;DR is that by stacking a monolayer 1 degree twisted from a bilayer and supercooling, an applied electric field could switch between it behaving like twisted bilayer graphene or twisted double bilayer graphene. And in the latter case it exhibited electrically tunable ferromagnetism 🤯 If you're ever trying to think of a video topic, definitely would be interested in something on graphene or other 2d materials.
@fizzyplazmuh9024 2 роки тому
Ooh! I have used a modified Bridgman technique to grow large naphtha crystals before. My family HATES mothballs now.🤮 I like to play with scintillators and particle detectors. Your explanations are so clear that you are filling a few of my gaps in crystalline ordering and thermal transfer and I am sure other things by the time I make it through all your videos. I once sat in prison for 15 years so I ordered and consumed books like "Geochemical Kinetics" and Pauling's "General Chemistry". They opened my eyes and mind more than highschool ever did. I get tingles up my spine when I get an idea that lets me apply this type of knowledge. I am an applied science junkie.
@TheJunky228 3 роки тому
I almost want to share this vid with my materials sciences professor! lol thanks for the extra articles and some great visualizations and explanations ^_^
@AlphaPhoenixChannel 3 роки тому
Haha please do! Glad you liked it!
@Jeremyak Місяць тому
I really appreciate this channel, it seems somehow more genuine than a lot of the over-produced "I heckin love science" content out there.
@hasanhas00n1 2 роки тому
As a material science graduate thank you for simplifying polycrystalline and single crystal in a way normal people can understand.
@RTR-py8wg 3 роки тому
This channel needs more views! I love learning from this channel!
@MarcusLucena2010 2 роки тому
i was mesmerized throughout the whole video, incredible work man!
@SWATforseen 2 роки тому
love your videos please don't never stop sharing and passing on really amazing knowledge an hard work that you put into this I hope and continue to see your videos shine and progress!!
@Justus_Patrick 2 роки тому
i just saw your "plan a" quote. That's so inspirational because its so true. Don't quit after your first failure, your first plan is supposed to fail.
@ethanfisher7330 3 роки тому
Hey, I recently found your channel and I love the content you are making! I am thinking of going to graduate school for material science so seeing the experiments you do with crystal growth and grain structures is really inspiring. I am excited to see the next video, and in the meantime I am going to look into the Bridgman method and other ways to control crystal growth.
@AlphaPhoenixChannel 3 роки тому
Awesome! MatSci is an amazing field at the intersection of so many others. What are you studying in undergrad? The Bridgman method is how most of our substrates are grown - they make a big cylindrical boule of something like Gallium Arsenide, then slice it into thin round wavers we can grow on. To be specific, I think they use a "horizontal Bridgman" technique, and I don't know what their growth rates are - certainly a WHOLE lot faster than our MBE growth rates!
@ethanfisher7330 3 роки тому
@@AlphaPhoenixChannel I studied mechanical engineering in undergrad and it wasn't until this last year that I realized I wanted to continue learning about the atomic properties of materials. When I learned that the reason metals have elastic deformation is because the atoms are literally stretching the bonds before they slip and plastically deform, my mind was blown! I've always thought the way metal boules are cast is fascinating. The level of purity we are able to achieve nowadays is incredible!
@thefipster 2 роки тому
UKposts is weird. My first thought was: Cool a new science channel that is actually interesting... let's check the videos.... wait this channel is already seven years old.... why did youtube hide this from me for all these years... at least now I can binge watch everything. Very informative channel with clear explanations, thank you sir, I will stick around!
@ericlotze7724 3 роки тому
Just discovered this channel ! I didn't know any of the "odd ice-es" were possible at home/makerspace scale, neat to see all this !
@ravenna6543 2 роки тому
That bird saying "No shit sherlock" at the beginning was such perfect timing. LMAO
@klausnielsen1537 2 роки тому
Looking forward to that vapor deposition video. Great video and great explanations. TY 👍
@TheBookDoctor 3 роки тому
Hey, you're on the cusp of 2^14 subscribers! Awesome!
@AlphaPhoenixChannel 3 роки тому
haha yeah I'm going to be a bit late on that video this time around
@joshhickman77 3 роки тому
Yeah, I'm always surprised that ice is a good thermal insulator, but I guess the igloo idea is pretty solid. The aluminium idea was really good though.
@AlphaPhoenixChannel 3 роки тому
Yeah - it surprised me too. One sentence that got cut from this video also pointed out that the seed crystal was oriented with the C axis up and down, meaning that all of the heat to freeze had to go through the slowest direction
@7177YT 2 роки тому
You got a pretty brilliant channel here mate! Subscribed!
@Blargthehandsome 2 роки тому
hey, I think your channel will blow up, keep up the good work!
@SpiritOfHugs 2 роки тому
If the subjects weren't incredibly interesting, I probably would still watch your videos just because of your energy. It's so fun listening to people that are truly passionate about something. You're cool.
@Physicist981 3 роки тому
Great video mate really informative! Subscribed
@xenofurmi 2 роки тому
This video is so good x10. The Material Science education is so on point.
@br6768 2 роки тому
This is a cool channel im so excited to sift thru the videos. I haven't been this excited since I found Applied Science channel like 3 years ago
@MrMcCoyD4 3 роки тому
Thanks for a great video! Looking forward to the vapor one :)
@AlphaPhoenixChannel 3 роки тому
me too... trying to get one more timelapse...
@heinzehrhart7142 2 роки тому
I saw your gerrymandering video first and thought okay that's kind of cool and now I'm bringing this channel. There are so many videos alone about f... Ice but every video still gives new info.
@adamlevesque3090 2 роки тому
in polarized light one can easily see the grains
@carlosreyes1278 Рік тому
Excellent, excellent video!! I thoroughly enjoyed it!! You've got a new subscriber!!
@muntyvalera998 3 роки тому
Wow such an awesome video bud, how have you not got more subscribers, I cant wait to see the video where it worked,
@bytesandbikes 3 роки тому
Great to see the process! Thanks
@AlphaPhoenixChannel 3 роки тому
SCIENCE!
@miklov 3 роки тому
Thanks for sharing, looking forward to, well, let's be honest, not only the pending video ^^. Keep up the good work!
@999bmxbandit 3 роки тому
Found you from Steve Mould. Great channel, great science, great speaking skills. I’ll definitely be back.
@AlphaPhoenixChannel 3 роки тому
Thanks! Glad you found here!
@KamilK3 Рік тому
Well thats awesome, that bubble demonstration and dislocations. The same applies to steel! I did know that, but thats a great way to visualize that, and that explains different properties of welds epending how hot it was and how quick it was cooled. Great channel! I'm happy i got here, you have a new sub ;)
@woosix7735 3 роки тому
Nice! Exited for the next one
@scottwilliams895 2 роки тому
I have two degrees in materials science, and was impressed by your video! Keep up the great work, and I'll keep watching
@scottwilliams895 2 роки тому
Now I'm just watching through a bunch of your videos, and I realize you degree is also in materials. That explains why you're so good at explaining it! Cheers, MatE!
@ericlotze7724 3 роки тому
One crystal related project area: Doing the same process of crystal growing + refining that is used for silicon or similar materials, but with sugar or something easier. So the "Molten Drawing" and "Float Zone Refining and all that. (Granted i just read some wikipedia pages! So all those terms may be wrong idk)
@ericlotze7724 3 роки тому
Essentially those "Sugar Growing Projects" in elementary school science fair, but cranked up to 11, and used to teach modern crystal growth techniques, instead of "crystals are a thing".
@maeday8839 2 роки тому
Thanks for sharing your process! I love seeing the fantastic and amazing things that can happen in this world but I also love seeing the 'failures' (any time when an outcome is different from a prediction) because that's where we get to discover something we didn't know before and expand our knowledge of the world. Achieving the goal is like chocolate sauce and the stuff you learn along the way is the ice-cream. Ice cream on its own is alright, but chocolate sauce on its own isn't that great. So thanks for giving us the ice cream!
@Pscribbled 2 роки тому
Have you tried growing monocrystalized ice by growing icicles in a controlled setting? I found some papers that some icicles are single crystals
@TheNormalUniverse 3 роки тому
beautiful video! That was super fun
@autodidact7127 2 роки тому
God dude you are just so intelligent. I will learn so much from you in the coming years. Subbed.
@jacobhinchliffe6659 2 роки тому
Milo
@TheZombieSaints 11 місяців тому
Wow who knew ice was so complicated... Great video
@trevorkohan505 Рік тому
I really like this guys stuff
@Some_Awe 2 роки тому
This is the stuff i needed with chemistry, i had a hard time thinking of it as a seperate subject from physics, but its just physics all the way down
@SoulDelSol 2 роки тому
Yess, physics is at root of chemistry and chemistry is at root of biology
@AJR2208 3 роки тому
Happy Belated New Year. This is a really interesting subject. (so many question)..Are you doing this to experiment with gas separation techniques? Water purity and controlled temperature reduction? Using capillary tubes for crystal growth? I had the honor to speak with people years ago looking into purifying medical & breathing gases in a similar way. Stay safe and well :)
@6754bettkitty 3 роки тому
Crystals are fascinating!
@AlphaPhoenixChannel 3 роки тому
So much!
@fmdj Рік тому
Awesome counter-example of publication bias, thanks! Always interesting.
@tophan5146 2 роки тому
I love the hand-drawn animations
@emilyrln Рік тому
Very interesting! Ice crystals are so pretty ❤
@KOWspazed 3 роки тому
A few TECs on a container and a bigger one on the aluminum bar would allow you to grow the crystal without needing to be in the freezer. You could also very easily monitor and control the temperature.
@jianshen2223 2 роки тому
This is pretty interesting. Will be great to see if you succeed
@JanBabiuchHall 2 роки тому
Maybe try adapting the Czochralski method. It's used for growing silicon crystals for semiconductors and also uses a seed crystal lowered from the top. The difference (in addition to what you mentioned about temperature control) is rotating the crystal / bath, which I sus suspect helps prevent dendrites.
@yallprettysus Рік тому
The Awesome science rabbit whole won't end! Off to 2^19 Subs with you
@truegret7778 2 роки тому
As I recall, single-crystalline silcon ingot growers rotate the seed in one direction (say clockwise) and the molten silcon in the cricible anti-clockwise, and slowly pull the seed upward at a rate that defines the diameter of the ingot. Could the same be done with the water "seed" and chilled water "ingot"?
@MalcolmCooks 2 роки тому
dude why am I only just finding your channel, these videos are really interesting, informative, and the production value and editing is off the charts
@SoulDelSol 2 роки тому
Same
@ericlotze7724 3 роки тому
If you did something similar to that "Supercooled Water" or a v e r y close thermal gap between the water and air, could you pull/draw an ice crystal from water?
@jimdelsol1941 3 роки тому
Thanks for the video !
@adcaptandumvulgus4252 2 роки тому
Do you think if you use the silver plating on the aluminum the extra degrees of temperature that would drop would make a difference?
@coffeecup1196 2 роки тому
Could you supercool the water without freezing it, then introduce a single-crystal seed? Kinda like how you can put a bottle of water in the freezer and every now and then it will stay as metastable liquid below the freezing point.
@8ank3r Рік тому
did you consider dipping sort of in the manner of candle making?
@chewmonkey89 2 роки тому
Would it be possible to change the atmospheric pressure (on one side) of the water to 'change' the freezingpoint helping forming hexagon?
@falpsdsqglthnsac 2 роки тому
"that's a loud bird" this is the educational content i come to this channel for
@CaskStrength777 2 роки тому
I found the shaped container idea intriguing.
@X_Potato 2 роки тому
I feel like this channel will blow up soon.
@labboc 3 роки тому
In the video you mention that ice conducts heat anisotropically. Would the seed crystal conduct better if rotated?
@malx1289 2 роки тому
Could you use constructive interference between two lazers focused at a point in the ice
@PabloRomanelli 3 роки тому
Could a Peltier module on the aluminum work? To keep the water outside the fridge and only cool it through the cristal touching the aluminum and the liquid water
@AlphaPhoenixChannel 3 роки тому
absolutely! the problem is keeping the cold side of the peltier cold if it's outside the freezer. that's a problem addressed in the next vid!
@TiagoTiagoT 2 роки тому
Does the orientation of the ice crystals affect light polarization?
@Ziraya0 Рік тому
A long time ago I saw a tv show, maybe how it's made, where they covered how blocks of clear ice are made for ice carving. The process is simple, get a big ole vat of water, make it cold, and move the water constantly with a pump. The main goal of this is that it takes more energy to form a crystal with contaminants, so with the temperature held at about 0C, and the water always moving, it's too hard for contaminants to freeze into the crystal, and it's too hard for voids to form. Only good pure water can join the crystal, and it does so evenly. This method may be able to increase the margin of error with your technique even as the water cools off, by lowering the temperature of spontaneous crystallization just a little bit further below the temperature of monocrystaline growth. I imagine though that it will also make the tank more efficient at conducting the heat in the water to the walls, making it cool off faster.
@Indie9999 2 роки тому
Well, what about when you supercool water in the freezer and you get that "shake the bottle and it all freezes" effect. What if you made some supercooled water and dropped one of these unicrystals into it? Would it just seed the growth of a solid block of one crystal?
@jazzdirt 2 роки тому
This is the same I learned in the first year of Material Science engineering... But accessible and fun!
@Inertia888 2 роки тому
Would a TEC thermoelectric module work, if it was set up to pump the heat way from the metal block, and to the water> Maybe with some heat pipes from on old laptop? I really don't know, I don't really have any intention of trying this myself, since I am already investing my time too thin on my own experiments and projects. Just thinking out loud. It is fun to think. Looking forward to the rest of the experiment. Maybe one day I will give it a try.
@sciencoking 2 роки тому
I collect rain water in barrels in my backyard. When the temperature is just right, the water forms a thick ice sheet which crumbles into long approximately hexagonal prisms
@themightyripples6582 2 роки тому
Could you use semi-randomly directed short blasts of high energy, then witness a very small hexagon within a dendritic region? Just curious...
@MrCofet 3 роки тому
Excellent video
@scheelescorvid1597 2 роки тому
What about hypercooled water seeded with a single grain crystal after it's been hypercooled, assuming you don't have nucleation sites for the water to crystalize on its own, can that work?
@SoulDelSol 2 роки тому
Good idea, cooled below freezing point
@trstmeimadctr 2 роки тому
COuld you get a single crystal if you super-cooled the water and then dropped the seed crystal in to begin crystallization?
@je_tai6276 2 роки тому
Do you think the convections movements in the water could create dentrites? Some convection cells would appear and cool the whole water recipient and then, because the thermal isolation with the outside is not perfect, some dentrites could have been created somewhere else. I would suggest to try the same experiment but with the aluminum bar at the bottom of the recipient. Might be a very tricky setup though...
@telperion3 3 роки тому
what about adding a peltier cell coupled with a heatsink on the top of the aluminum bar, in room temperature?
@AlphaPhoenixChannel 3 роки тому
wait a couple weeks =)
@jeanpafy 3 роки тому
I love your videos!
@AlphaPhoenixChannel 3 роки тому
Thanks!
@chbrules 2 роки тому
Is there monocrystalline metal? I imagine it would strengthen materials significantly. Same with carbon lattices and such.
@TheMagicFlutist 2 роки тому
I think monocrystaline metal is used in jet engine turbines
@jfischer507 2 роки тому
Can the water be held still in the refrigerator, at 2-3C, instead of the freezer? Maybe alcohol could be pumped through the heat sink below 0C to encourage crystal growth and discourage dendritic growth. Then you can go really slow.
@tootalldan5702 3 роки тому
Nice process. Instead of a magnifier glass, why not use the 3 laser method on each axis to melt the center of the ice. Similar to the acrylic bubble art. As you also mentioned, the pressure change as it is freezing would affect growth. Would a counterweight of the aluminum block also allow equalizing the pressure at the freezing point in the chamber to equalize the surface pressure of the water? I look forward to the next video.
@dumi08 2 роки тому
Can you grow ice with the Czochralski method?
@jakeh799 2 роки тому
10:46 for like 20 secs I did not understand a word he said but just the way he speaks with the Pauses and tone for some reason I feel like I understand him.
@geoffgeoff143 2 роки тому
Can you vapourize the inside of an ice cube with a laser causing it to explode? Would the preasure increase stop change of state? Would it find a point of equilibrium? Would the latent heat effect stop anything happening at all other than slowly melting the whole cube?
@tsraikage 2 роки тому
what if you put seed crystal like you did but instead of aluminum block use aluminum cup and pour liquid nitrogen or put there dry ice or something like it. wouldnt it work? the rest of the liquid would be at the room temperature
@mso2013 2 роки тому
Does the size change not have any impact? Edit: from freezing the water
@VocalMabiMaple 2 роки тому
I've been binge watching your videos and I just realized why your videos reminded me of something. Do you watch the UKposts channel "Knowing Better"? Your style reminds me of his style, except science instead of politics and history.
@anothrto1045 2 роки тому
A must for ice sculptors
AlphaPhoenix
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