Hi, I've just started making silver clay pieces and have made a few circular necklace charms with names stamped on them.
I followed the instructions to make, dry, sand, fire and polish them and they looked great.

Two people bought them from me and both have come back saying their pieces have started to tarnish already. The first person noticed it happening within about a week and the second person said it has happened after wearing her piece for only a day!

I'm at a total loss as to what to do! I advised to try cleaning the piece with bicarb of soda which the second lady has tried and says it took most of the tarnish off.

I don't know how quickly it will tarnish again though or how to avoid this happening to all the pieces I sell.

Help!