Testing Glass Paint for Reactions

Testing Glass Paint for Compatibility and Color-fastness

I am a huge fan of testing any and everything before I commit my time to a big project.  It is also quite useful to have these tests on hand for later reference, or as an example for classes, workshops, or even studio visitors.

Paint tests can be useful for both recycled glass and for art glass.  Start with a piece of base glass and all of your paints.  My base glass is float since that’s what I most often paint on, and Glassline Paints, as those are the ones I paint with.

Starting on one side, draw a long line of one paint color, and then another across it at an angle.

Repeat with each color so you have a grid of overlapped paint lines.  The idea is to have every color cross every other color.


Now fuse the test piece.


The finished test piece can tell us many things:

  • How the paint color changes during firing
  • If the paint colors react to each other
  • If any of the paint colors have glass compatibility issues (use your polarized film to check for this)
 It’s a good studio practice to make and keep tests of every new product as you add them to your art options.  Based on past experience, it’s beneficial to choose a standard, easy to store size of base glass (I didn’t, and should have.)
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