0001234 Striker !! Striker !! In the delivery state, this glass can be pale to even colorless and only develops the target color when it is heated to a full fusion temperature of 804 ° C. To develop the color, expand the firing curve by one step in the heating phase: "hold at 662°C for 2 hours" For mosaic and stained glass: ask us about the current batch. Contains lead May react with selenium, sulfur