Silver discoloration after cooling?

[Niamh]

Hi all, Me again so sorry!

Can borax cause silver to discolor?

I melted some sheet silver yesterday in my crucible added a pinch of borax and didnt cast the silver because it didnt melt enough and i was in a rush so i let it cool in the crucible and came back later. When i took the silver out the underside which had been in the crucible has a blue enamel looking coating its a very hard shiney blue which is admittedly a very pretty colour but not what i expected?! Is this colour caused by the borax? the crucible has had nothing blue in it. thank you

[swageblock]

Yes the flux will cool and become an enamel like coating,colour depends on flux,temperature etc.It doesn`t affect the silver and can be removed in pickle or left and burned off during next melt.