Glass Painting

[Naturalee]

I took a class at a local ceramic shop on glass painting but I cannot
get the desired results I want. It seems the colors are transulent and
even after firing they are dull. I am painting on beveled glass using
Satellite-Unique Glass color paint. I am firing the pieces at cone 015.
If anyone has any suggestions on how I can perfect this, please let me
know. You may email me at mich...@naturalee.com

[Joseph S. Wisniewski]

1) You're probably getting chrystaline material forming in your paint or
the glass itself. Try a devitrifying spray. Don't use it too heavily.

2) Electric kilns usually cause glass colors to reduce. Gas kilns can
reduce or oxidize (your choice). Watch your atmosphere.

3) Can you get access to a kiln with a thermocouple pyrometer? Trying to
fire glass to those annoying cones is not really feasible. I can't
remember where cone 015 is, but I bet it is above the annealing
temperature for your glass. You may need to run an annealing soak after
the firing.

--
Joseph S. Wisniewski | Views expressed are my own, and don't reflect
Ford Motor Company | those of the Ford Motor Co. or affiliates.
Project Sapphire | Trans Am, Daytona, Bonneville, and IROC are
jwis...@ford.com | just races, won by people driving Ford cars!

[Yuancao]

I guess your "glass painting" reallly means "glaze".

Cone O15 is quite a low temperature. Some heavy-lead glaze may be able to
give the effect you want but I think it's hard. You can test the folloing
trials:

1. Try to raise your temperature if possible (to Cone O12 or so). See what
happened.

2. Contact some art glaze suppliers, such as Ferro (Cleveland, OH) or
Mayco (Columbus, OH) for better glaze.

If you need more specific info, let me know.

Yuan Cao
An Alfred Alumini