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MariaPolky

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Posts posted by MariaPolky


  1. 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??)


  2. Weirdly, and I promise, this is not a prank.

    The cone 04 was a pile of white fluff and the cone 6 was a softer long thing.

    The only way to get the hard long thing is if you take it to cone 10. Also this was oxidation, the reduction was not nearly as cool.

    If you have a kiln and a test tray you should try this and let me know if you had a similar experience

     

    I had my critique today, but I'm still pretty confused. A grad student said that when he was in undergrad somebody put a lot of pennies on her sculpture and they all made these wire things, like a fountain. I'm definitely going to keep trying this

     

    So this was my testing

    post-18950-135484482553_thumb.jpg

     

     

    Another penny in a clear glaze. The cord broke so it's pictured just resting

    post-18950-135484485431_thumb.jpg

     

     

    Close up of what happened with just a penny (this cord broke too, so it just reasting next to it's ... I guess root?)

    post-18950-135484489799_thumb.jpg

     

     

    and finally this was the penny in reduction

    post-18950-135484492679_thumb.jpg

    post-18950-135484482553_thumb.jpg

    post-18950-135484485431_thumb.jpg

    post-18950-135484489799_thumb.jpg

    post-18950-135484492679_thumb.jpg


  3. I'm not sure if this is the right place to address this topic, but I'll go for it.

     

     

    I had a class assignment to make any kind of experiment to learn more about material science, so I decided to test if pennies, nickels, and dimes could be used as a colorant when submerged in a glaze, and taken to cone 10. This definitely didn't work, as the nickels and dimes melted, and actually burned through the clay test trays :/ but the pennies did something so strange that I really cannot begin to understand...

     

    The first is a penny alone in a clay tray, taken to cone 10

    post-18950-135476413103_thumb.jpg

     

    The second is a penny submerged in a clear glaze and taken to cone 10

    post-18950-13547641384_thumb.jpg

     

    All my penny tests grew these hard, textured, cord-things. It was definitely a shock.

    I'm wondering if the reason for this is that the Zinc being the majority of the penny (I used post 1983 pennies) turned to calx because it melts at such a lower temperature, and since the copper is surrounding the zinc, maybe the zinc was pushing it's way out of the core and squeezed out, hardening along the way??

     

    Does anyone have any ideas? I'm open to any thoughts, I'm completely confused by these little aliens!!

    post-18950-135476413103_thumb.jpg

    post-18950-13547641384_thumb.jpg

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