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I tried it two different ways, first with two holes (one on top and one on bottom) and after it was blown I plugged up one end with clay and enlarged the other for pouring to about 1cm^2. For the second way, I made a single hole that was fairly large and poured the egg out of that hole (3-4cm^2). I found that both methods worked but the second way was easier because you don't need the clay to plug the other hole.
You can usually find bismuth on line for between $10 and $16 a pound depending on the amount you purchase (the more you buy the less it is per pound). I purchased my bismuth here (http://stores.ebay.com/cerroboltonmetal/).
After pouring out the remaining liquid bismuth it took about 10 minutes for me to feel comfortable holding it to break off the shell.
Thank you! I had a great time doing it.
I purchased my bismuth from Cerro Bolton Metal on Ebay (http://stores.ebay.com/cerroboltonmetal/). They were very easy to work with and had very fair pricing.
It is really amazing to see these beautifully individual sculptures develop before your eyes.
Bismuth EggsView Instructable »
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