Kodak thin film resist for etching sterling?

Does anyone have any experience with Kodak Thin Film Resist (KTFR)
for etching sterling?

I have both the resist and the developer which was purchased about
20 years ago, but never used due to life’s circumstances. It has been
stored in a climate controlled room through the duration.

My primary question since Kodak no longer has any tech support on
this product, is it still good? If so, any tips on using it, safety
and such?


J Collier Metalsmith