Texture/Plaster/Silica/and Iridescent Glass
and millions of tiny bubbles!!!!!

by Melanie Rowe
and Leslie Rowe-Israelson

click on any image to enlarge

Above is the wax positive that was used to make the plaster mold.

Below are closeup images of the glass after firing.

By placing the iridized surface down onto the plaster, you will get a clean and wonderful surface, but just under the surface are tiny bubbles. But they do not take away from the piece... they add character. You get NO sticking of plaster either and cleanup is very easy. Clear gives a lovely matte finish... this is just a different look focusing the eye on the surface.

Place wax positive down on surface and put release on remaining area. (I prefer to use a large hard plastic surface that I can peel off the finished piece to turn over). No release needed on plastic so it is cleaner.

Seal wood outer frame with clay and don't forget to seal wax positive.

Sealed and ready for pour. Keep covered with plastic

Mix 1 part #1 pottery Plaster/Silica Flour/Tepid Water and gently pour over piece, banging on table as you go to bring bubbles to surface. Try to get as even as possible.

When plaster has set (about 10 minutes) mix Gerry Newcomb with tepid water. Follow directions on package (or use the same as plaster, 2 parts mix to 1 part water . Keep adding mix until it is like thick cottage cheese.

Take outer frame away and clean off clay when set (one hour approx.)

Steam out wax with wallpaper steamer (or pressure cooker). Careful not to let water run low. Place wax on board with hole in it and place plastic bag over to capture steam.

Pour boiling water into mold to clean out all remaining wax residue.

Place in kiln on large kiln shelf with one inch of sand underneath. Don't forget to level!!!

Begin to place colour bits down if desired.

Set iridescent (or cathedral) sheet down into mold (set on corner pieces of glass to raise above pattern is the design warrants this.

Continue to add color layers of glass sheets to create colour pattern (you can just use billets if desired).

Then place Billets away from edge so glass will flow nicely. Make sure the the layers of sheet glass are at least 3 layers thick if piece is large as weight of billets is heavy.

Heat up.

Kiln Cast Glass Firing Schedule for a 3" Thick 21"wide x17" long

It is very conservative

Spectrum and Uroboros (System 96) Sheet glass , Frit , and Billets,

Pre-fired sliced cane and Lampworked pieces

2 hours up to 250 F
10 hour hold at 250 F
10 hour up to 1220 F
2 hour squeeze at 1220 F
2 hour up to 1500 F
1 hour hold at 1500 F
Quick ramp down to 1200 F
1 hour hold at 1200 F
2 hour down to 955 F
20 hour Anneal at 955 F
50 hours down to 800 F
24 hours down to 700 F
30 hours down to 100 F
Click here for a PDF copy of this schedule


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Created by Blasted Glass! Studio