You can create nicely rounded cabochons from stacks of 0.75” (20 x 20 mm) squares, thanks to heat, gravity, and the 6 Millimeter Rule. But be careful…they’re addictive!
Some Design Layer Possibilities
Blue/Vanilla part sheet: Scatter Steel Blue Opalescent coarse frit (000146-0003) onto a base of 3-mm Clear sheet glass, then sift a heavy layer of French Vanilla powder (000137-0008) over the top to cover. Fire to a full fuse. Maximize depth by arranging the Clear side toward the top of the stack.
River Rock Reaction (See Quick Tip: River Rock Reaction)
Pieces of Citronelle Opalescent (000221-0030) and
Turquoise Blue Opalescent (000116-0030).
Top (6 mm): A “lensing” layer of Clear. This layer will stretch considerably.
Middle (3-4 mm): This “design” layer will stretch and be visible through the top layer. Use part sheets or pieces of 3-mm sheet glass.
Bottom (6 mm): Typically not visible from the front. This layer will stretch the least.
6-mm Tekta Clear is a natural for this project. It’s more efficient, with fewer pieces to cut, clean and assemble!
Measure and score a grid of 0.75″ squares, then run them using the Rule of Halves. Two layers of 3 mm will also work.
A dab of GlasTac Gel will keep the stack together before firing.
The stacks flow out to about 1.25″ (32 mm) in diameter, so give them room.
For the cleanest release, we recommend firing on ThinFire.
Cabochon Firing Schedule
Rate Temperature Hold
1 400°F (222°C) 1225°F (662°C) :30
2 600°F (333°C) 1525°F (829°C) :30
3 AFAP 900°F (482°C) 1:00
4 100°F (56°C) 700°F (371°C) :00
5 AFAP 70°F (21°C) :00
Note: This heatwork goes beyond what the glass is tested for. Some styles
may opalize and/or shift in compatibility. Test before making multiples.