Deer Dee, The best way to
The best way to find out is to use some (you can mix it with clear glass fine frit or powder and aloe) place it on a small 2″ x 2″ glass – crystal clear would be your best bet – let it dry than cover it with a piece of clear and fire it at full fuse temp.
Glass and metals can react with each other – like red glass turns black where it is touching fine silver. I don’t know if this would be the case with gold and colored glass, this is why I suggested the crystal clear. Experimenting is the key of the game – with just small amounts of coarse.
petra kaiser – http://www.kaiserlee.com