The right answer to this, and any question is…
What sort of finish would you like to achieve? What size are the
products in question? Will they be worn, displayed out in a garden,
mounted to a motorbike?
Yes, in most cases a plastic collander will work, and it can be
something like a multiply-perforated plastic cup from Taco Bell. All
you are looking for is a chemically inert dip-and-drain vessel.
And, yes, since many patinas involve pH extremes, rinse well, let
dry, and consider a clear-coat finish to protect all that work.
KEEP RECORDS. Exact metal alloy, method of fabrication, size of
piece, chemical/concentration used, aftercare, and moon phase if you
Best Wishes, Dan Woodard
Indian Jewelers Supply Co.