In Lisa's initial experiments, she tried to create Sterling silver clay using Hadar Jacobson's metal clay powders. This was unsuccessful.

But Hadar has done some tests and managed to successfully make Sterling clay. Lisa's mistake was to use Hadar's original copper clay powder, not the Quick Fire Copper Clay. Here is an example of a ring Hadar made using the Sterling clay firing schedule developed at MCSJ.

See Hadar's complete posting about this on her blog here.

There were also issues with some of the clay experiments. Some samples bubbled during firing.