Hello everyone! :-)

My name is Kat and I look forward to browsing the font of knowledge here!
I've recently taken the plunge into this wonderful world and I have what is probably a "newbie" question, but I can't find an answer elsewhere; so please forgive me...

Should Prometheus Copper Clay stay shiny for at least a short time before tarnishing? My pieces are going dark within minutes of polishing, eventually going a dark matt brown after a few hours. I polished the hell out of one piece and that now has these odd patches of dark grey on it... I can't get my head around it!

Any advice would be greatly appreciated :-)