Kiln Firing

 

To permanently fix the glass paint or stain, the glass needs to be heated up to its softening point in order for the pigment to fuse with the glass surface.  This requires temperatures in excess of 650c which will vary depending on glass type and application.


 

One of the few major changes in the production of stained glass over the centuries has been the development of modern kiln technology.  Where once upon a time kilns were wood fired and temperature was assessed visually, nowadays they are either gas or electric powered.

With the introduction of digital pyrometers, temperature control is now extremely accurate and precise.  When the kiln has reached the required temperature, the glass and kiln shelf are glowing bright red.

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