Glass powders will burn off at high
temperatures.
No. The powder is glass. Glass does not evaporate or otherwise combust
at kiln forming temperatures.
The
appearance of glass powders fading at fusing temperatures is related to the
different appearance before and after firing.
Before firing, the powder looks both denser and paler than the final
colour. The initial experience with
glass powder always is to put less on than needed.
You need to
remember that a thin film of powder is a tiny fraction of the thickness of the
glass it is made from, so the colour will be much fainter. A considerable amount of powder is required
to give the colour shown by the colour charts – as much as 2mm for paler and
transparent colours. Opalescent colours
show a little better with thin applications, but still require significant
amounts.
This shows the application of powder on a piece where the powder provides almost all the colour for the piece. |
The best procedure
is to make test tiles with varying amounts of the powder to determine the
thickness required for your desired result.
This gives a visual reference and experience in laying down the powder
in appropriate thicknesses.
The
appearance of the glass powder burning off, is merely the application of too
little powder.
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