It is different than iridescent. It is low fire, not high fire like iridescent.
It is intended for reverse fusing. That is when your piece is face down on the kiln shelf and you build backwards.
Fire coated side down. If you are firing on a textured mold put a piece of thin fire on between your boron treated mold and the glass. If you fire it coated side up or cover it with another piece of glass, you will lose the coating.
If you are slumping and do not go over 1200 degrees you can slump with the luminescent up and not lose it.
It is food safe and has been tested by the FDA. However, please note that once the piece has been fired in your kiln it is no longer a Wissmach product it is your product. If you have been firing glass that could leave lead or cadmium traces in your kiln, that could get on the product.
First one fired with thin fire in between. Coating face down. The second piece was face down directly on the mold.
Firing schedules courtesy of Petra Kaiser and Wissmach Glass.
Standard Fusing Schedule – 2 layers thick
Segment 1: 600°F/hr up to 1000°F hold for 10 minutes
Segment 2: Full/9999 up to 1410°F hold for 10 minutes
Segment 3: Full/9999 down to 950°F hold for 60 minutes
Segment 4: 100°F down to 700°F hold for 1 minute
Tack Fuse, Polishing and/or Slumping into a mold
Segment 1: 300°F/hr up to 1000°F hold for 10 minutes
Segment 2: Full/9999 up to 1300°F or 1350°F (depending on your desired results) hold for 10 minutes
Segment 3: Full/9999 down to 950°F hold for 60 minutes
Segment 4: 100°F down to 700°F hold for 1 minute
Draping over a mold and/or polishing
Segment 1: 300°F/hr up to 1000°F hold for 10 minutes
Segment 2: Full/9999 up to 1200°F or 1220°F (depending on your desired results) hold for 10 minutes
Segment 3: Full/9999 down to 950°F hold for 60 minutes
Segment 4: 100°F down to 700°F hold for 1 minute
Note: not all kilns are alike. Your kiln size, controller type, and individual project may require some alteration to the schedule for best results.