Question:
What is Lustre?
Troubleshooting: Dull lustres/metallics
Cloudy or dull lustres or metallics may be caused by insufficient ventilation or firing to an excessive temperature.
Applying Mother Of Pearl
A proper finish of opal and mother-of-pearl lustre can be guaranteed with a light application.
stamping
Lustre and metallics can be applied by rubber stamping.
Applying to a textured body
When applying lustres to a textured surface, be sure to brush out the excess overglaze from the crevices while it is still wet and can be seen. If you do not it will burn off in these recessed areas during firing.
Applying over glaze
Lustres and metallics take on the surface texture of glazes they are applied over. Satin or matte glazes will yield a dull finish and gloss glaze will yield a dull finish and gloss glaze will yield a shiny finish.
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.
Evaporation
Lustres and metallics do have a suspension agent and are subject to evaporation. This is why there are thinners that can be added to them a drop at a time to get them back to proper painting consistency.
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.
Multiple applications
You may use more than one overglaze on apiece but they should be fired between applications
Never patch lustres/overglazes
Never patch a spot with overglazes. Go back over the entire area and re-fire.
Poor adherence
Poor adherence of lustres/overglazes to an object can be caused by poor ventilation, insufficient temperature, or contamination on the ware.
Spraying
Lustres can be used in a spray bottle or air-brush. It is necessary to follow cleaning procedures and practice to get the proper coverage.
Lustre-on-lustre
You can apply opal or mother-of-pearl lustres over a fired coat of another lustre or mettalic.
Marbleizing liquid
Marbleizing liquid is a water-based product and the brush should be cleaned in soap and water.
Application speed
Speed is necessary when applying lustres. They dry very fast and if you take too long, they could dry, forming rings which would be unattractive.
Thinning
Overglazes may be thinned with essence (Gold essence for metallics, lustre essence for lustres). Add essence one drop at a time to avoid over-thinning.
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| Guru Spotlight |
| Jolyn Wells-Moran |
