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About the use of copper salts for fusing/granulation: One Internet
article said that the copper bond will get stronger with each
heating. That would allow you to build your pyramid shapes by fusing
each layer separately. But I don't know if the information is
correct (and can't remember who wrote it).
I hadn't needed copper salts for fusing, as long as I used a
tabletop kiln and a torch with a small, soft flame.
That torch recently broke* and I can't dial down the new torch
enough to avoid overheating the entire piece, so I've gone back to
using copper salts. It's easy enough to make a copper solution, but
I happened to have antiquing solution
(http://www.modernoptions.com/SFpages/PGangel.html) and it works
*It was a $10 Bernzomatic microtorch--a poor-quality tool that soon
developed problems. In one way it was the perfect torch for fusing:
The nozzle gunked up until it could only produce a short, round
flame. But it also leaked and after a few months wouldn't work at
all, so I don't recommend it.