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The plate we have is brass and about a sixteen thick. But bowing it is
a bit of an art. The art is removed if you use a poweramplifier and a
speaker cone to drive the place. I believe Pasco makes such a thing.
Also, I would use sand rather than lacapodium (however you spell it)
powder.
I anodized my plate and dyed it black. I used salt from a shaker. If you
use lycopodium you find the initially surprising result that it migrates
to the antinodes rather than the nodes. You can use this method to
separate a mixture of lycopdium and salt, a nice trick.
Leigh