I have ferric chloride to etch tool steel to make patterns for
roller printing designs on sterling. Does anyone have an idea as
to how much ferric chloride to water I should use? And can I use
the same pnp transfer system that one would use with ferric nitrate
Start with 1 cup crystals to 4 cups distilled water, and adjust up
or down accordingly. In the absence of a hydrometer, you'll have to
have some test strips for figuring out if you need more ferric or
more water. PnP works fine for steel and FeCl2.