I have several dyed black onyx cabs that I’d like to have a frosted
appearance, but I’m not sure of the best way to achieve this finish.
Would a glass etching cream work or is it best just to sand them by
hand? (I don’t have a sand blaster) Do I need to seal the stones
after frosting them? If so, how should this be done?
I realize onyx isn’t an expensive stone, but I’d hate to ruin
perfectly beautiful stones with trial and error. I know prehnite
becomes gelatinous when exposed to HCl, but can’t seem to find
anything about onyx precautions in a search. A few people have asked
this same question in the past (archives), but I don’t believe they
received technical assistance.