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I put a penny in the kiln- but what in the world happened?


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#21 OffCenter

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Posted 08 December 2012 - 10:22 AM



The only way to get the hard long thing is if you take it to cone 10.
-MariaPolky




Amazing like magic

I making a t shirt with your quote above, hope you dont mind


Put me down for one, Big Dave.

Jim
E pur si muove.

"But it does move," said Galileo under his breath.

#22 MariaPolky

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Posted 09 December 2012 - 02:59 PM

Damn! Isn't it weird that so many of us who have been potting for centuries didn't know about this! I think of all the weird things I have put in firings from moth balls (not their actual balls, but the chemical pesticide) to deer livers and I never tried a penny! Can't wait to put one in my next firing. Wish I could afford to put a nickel and a dime in, too.

Jim


Since nickels and dimes are mostly copper, they become molten and burn through their clay test trays, so keep the laundry money! :)
Pennies are really the only coins I've found that have amazing results, without burning through anything.
(also WHAT happened with deer livers??)

#23 MariaPolky

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Posted 09 December 2012 - 03:20 PM

For what it's worth, good to note that Zinc's boiling point is only ~1650F, and Zinc vapors are mega bad for you... So only do this if your kiln is well ventilated.


Thanks, that's good to know

#24 MariaPolky

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Posted 09 December 2012 - 03:22 PM



The only way to get the hard long thing is if you take it to cone 10.
-MariaPolky




Amazing like magic

I making a t shirt with your quote above, hope you dont mind



haha, that's great

#25 OffCenter

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Posted 09 December 2012 - 06:37 PM


Damn! Isn't it weird that so many of us who have been potting for centuries didn't know about this! I think of all the weird things I have put in firings from moth balls (not their actual balls, but the chemical pesticide) to deer livers and I never tried a penny! Can't wait to put one in my next firing. Wish I could afford to put a nickel and a dime in, too.

Jim


Since nickels and dimes are mostly copper, they become molten and burn through their clay test trays, so keep the laundry money! Posted Image
Pennies are really the only coins I've found that have amazing results, without burning through anything.
(also WHAT happened with deer livers??)


That was 40 years ago so I don't remember but it must not have been anything impressive or I would still remember it.

Jim
E pur si muove.

"But it does move," said Galileo under his breath.

#26 perkolator

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Posted 10 December 2012 - 04:53 PM

wow, that's crazy! we've accidentally and purposefully fired coins in the kiln before, but never had any results like this. gonna have to do some experimenting!

#27 Judd

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Posted 11 December 2012 - 10:54 AM

It's the zinc ash as it burned off in the kiln. I know because of past experience/experiment: I fired some galvanized wire mesh with window glass on top and got the exact plumes you did. I only hit 1750 F, but it was still hot enough for the zinc to burn out. I got pictures of it... somewhere. Way cooler than the experiment.



#28 Pres

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Posted 13 December 2012 - 05:53 PM

For what it's worth, good to note that Zinc's boiling point is only ~1650F, and Zinc vapors are mega bad for you... So only do this if your kiln is well ventilated.


I'm wondering if it does have something with the boiling of the zinc, and the small amount of copper. It looks much like the 4th of July smelly snakes that grow out of a small tablet. The oxidation causes gasses to rise, and form a snake like form. I think this may be happening here.

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#29 yedrow

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Posted 20 December 2012 - 01:45 AM

I was wondering that the zinc might be fluxing something when I first saw it, but I to quickly assumed the structures coming out of the trays were testing probes or something put in after the firing. Now, my guess would be that you are growing crystals. I would guess that the narrow tops are from the lower energy level of the early vapor condensation and accretion on I guess a crystal imperfection, then when the material became more energetic the diameter expanded to allow the molecules to order themselves accordingly. The structure has to be light enough to be lifted by the surface tension of the source material. But, that is a very uneducated guess. Beyond that, wow, how cool!

Joel.

#30 Thrown_In_Stone

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Posted 21 December 2012 - 07:37 AM

How odd.

Dont think I'll be in any hurry to test it out though.

#31 Paddy Moloney

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Posted 28 December 2012 - 07:34 AM

I've worked in 3rd level art school, ceramics,for about 30 years and have seen some strange shite; this one, however goes straight up there to the top of the 'Beats me' board. Very strange, interesting, baffling even! Now to try it with some Irish coins (we still have a few to spare) and see what happens.....maybe I'll get a shamrock?

#32 amylaloon

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Posted 01 August 2013 - 08:08 PM

hey, i know im coming into this conversation kind of late, but i hope this is the kind of forum that bumps new posts in old topics up to the top. I just had to go someplace with high speed internet and make an account on here specifically for this, because I too wondered what would happen to pennies in the kiln, and after doing it and getting similar results i thought, i should google that and see who else has done it, and i found this. it really is surprising that more people havent done this. anyway, i wanted to add my pictures of the funk. 

 

2df6bebf56bc6c822257afc70ecfc3ed.jpg

 

this is cone 6, and there is a little bit of glaze under each penny, i just noticed how huge this picture is... i did break the longest coolest thingy taking it out. put that on a t-shirt! hahaha. but the three out front sort of turned into little mid-evil maces.



#33 Bob Coyle

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Posted 02 August 2013 - 01:35 PM

WOW! There is some weird chemistry and physics going on here. Are the tubes all hollow? It would be interesting to find out what the chemical composition is of the tubes.



#34 OffCenter

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Posted 02 August 2013 - 03:58 PM

I've been saving up so I can afford to do that experiment.

 

Jim


E pur si muove.

"But it does move," said Galileo under his breath.

#35 oldlady

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Posted 02 August 2013 - 04:40 PM

way back in the 70's i put a penny on a shelf.  it went halfway through the shelf and left a black molten lava looking mess behind.  that was at cone 6.

 

i want the shirt.  especially if the attribution is included.


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#36 greenerkittykat

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Posted 27 May 2014 - 02:56 PM

I tried this too. It works great. 

I used lots of different pennies and came up with some very cool sculptural explosion. I only went to cone 06, and tried it three different times.

Here is what I got.

 

I would love a chemical explanation of why this happens! AS SOON AS POSSIBLE!! :)

Kat

 

Attached File  b.jpg   97.17KB   1 downloadsAttached File  a.jpg   113.32KB   0 downloadsAttached File  IMG_20140520_143233_297.jpg   43.21KB   0 downloadsAttached File  IMG_20140520_133500_409.jpg   121.17KB   0 downloadsAttached File  IMG_20140511_140456_040_zpse49074ad.jpg   60.2KB   0 downloads



#37 mregecko

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Posted 27 May 2014 - 04:17 PM

Umm... It looks like one or two of those tubes went into your element's groove. That's really not good, and could potentially damage the element depending on what the substance is made of. Just be careful with this experimentation.

#38 PuckGoodfellow

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Posted 27 May 2014 - 04:54 PM

i would love to have one of those shirts!! ^.^


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#39 Tyler Miller

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Posted 27 May 2014 - 09:32 PM

I tried this too. It works great. 

I used lots of different pennies and came up with some very cool sculptural explosion. I only went to cone 06, and tried it three different times.

Here is what I got.

 

I would love a chemical explanation of why this happens! AS SOON AS POSSIBLE!! :)

Kat

 

attachicon.gifb.jpgattachicon.gifa.jpgattachicon.gifIMG_20140520_143233_297.jpgattachicon.gifIMG_20140520_133500_409.jpgattachicon.gifIMG_20140511_140456_040_zpse49074ad.jpg

Most pennies in circulation are copper plated zinc.  You made zinc oxide.  Via the french process to be exact.  Zinc vaporizes in the kiln and reacts with the oxidizing evironment, and you get solid zinc oxide that doesn't decompose until much hotter.  The unique shapes, I think, come from the way the kiln heats up and vaporizes the zinc.



#40 Stellaria

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Posted 27 May 2014 - 10:54 PM

Cool. You guys made sunscreen. Break out the mortar and pestle!




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