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granulation
On Apr 19, 10
Still, I'm curious. Can you explain how Ronda does it? thanks. Peter Rowe Hi, Peter -- I've take both of Rhonda's classes in granulation, and she teaches slightly different techniques for fine silver and for gold. For silver, no copper or other metallic salts are involved. I believe it's just finely controlled fusion. She uses a fine silver base and fine silver granules. The "glue" is a mixture of green flux, hide glue, and water. Granules are placed wet with a fine brush, the piece then dried on top of the beehive kiln until the glue carbonizes, then it is fused in the kiln with a delicate application of direct torch heat from above. It's normal for students to partially or completely melt the first couple of pieces -- I think it's her way of teaching fine control of the torch heat. Once you can consistently fuse the silver pieces, gold becomes easy. For 22 kt gold granulation, she DOES copper-plate the granules, and also brings up a 24 kt surface on the substrate by repeated heating and pickling until no oxides form. Granules are placed and fired as described above, and the copper plating disappears during firing. Regards, Bob Edwards |
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