GordonEndersby:
I do mine on the stainless steel sink in the kitchen.
Ceramic sinks would be just as resistant in case of spills.
I do my etching in sealed food containers to prevent spills.
You can leave the chemicals in the sealed container till you need them again.
Food grade plastics are proof against the etchants just make sure anything used is marked "not for food use".Ive seen no staining or marking on the surfaces and as its on the drainer if anything does spill its easy to dilute and wash down the sink.
Gordon
Have you ever spilt ferric chloride on the stainless steel?
I though it would attack it
or have you been careful/lucky up 'til now?!?