Question:
How do I fire overglazes/lustres?
Application temperature
Pieces to be decorated with overglaze should be at room temperature. Articles from a hot kiln will cause he oils in the overglazes to evaporate
Under-firing
Underfiring an overglaze will prevent the glaze from becoming soft enough to receive the colour, thus causing poor adherence.
Overglazes
When loading your kiln with pieces that have lustres/overglazes, be sure to leave plenty of room between pieces and do not cut off ventilation to the bottom pieces by covering them with a full shelf.
Troubleshooting: Black or white speck
A black or white speck in your lustre/overglaze after it has been fired may be caused by dust
Colour depth
If you want a deeper colour of overglaze, don't try a thick application to do the job. Apply normally and fire, then apply another coat and re-fire.
Re-firing
If a spot or blemish does appear on your overglazed piece when removed, do not try to patch it. Cover the entire piece with another application of colour and re-fire.
Overfired lustres
Cracked metal overglazes are caused by firing to an excessive temperature
If a piece removed from the kiln that has had gold applied has hair-line cracks, it has been over-fired.
Firing
In firing an overglaze, the glaze is softened to the point where the overglaze settles onto the softened surface and becomes a part of that surface.
Poor adherence
Poor adherence of lustres/overglazes to an object can be caused by poor ventilation, insufficient temperature, or contamination on the ware.
When gold comes out of the kiln with purple spots
When gold comes out of the kiln with purple spots it is usually caused by too thin an application of gold or too much thinner in the overglaze.
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| Guru Spotlight |
| Patricia Walters-Fischer |
