Description
Powdered underglazes can be used to colour glaze, clay bodies or slips, just like stains.
Powdered underglazes are generally used for hand painting decoration onto bisque clay, but can also be applied to greenware.
Underglaze Powders.
Please note that our underglaze powders are pigment only and don’t contain any glaze material.
To create an underglaze you need to mix with a China clay and a frit as well as water or universal medium.
A suggested recipe is;
- 1 part Underglaze powder
- 1 part Grolleg China clay
- 1 part Frit 3124
- Add water or medium to desired thickness.
Mix thoroughly and sieve through an 80 mesh sieve.
This mixture is then applied to dust-free and grease-free bisque ware/greenware, and then can be covered with a suitable clear glaze.
- Unlike glazes, underglaze colours can be mixed together to create new colours.
- Powdered underglaze colours will last forever if stored in a dry air tight container.
- Suitable for use to 1280°C
How To Use
Underglaze powders can added to the following liquids
Glaze Medium - A water based gum medium, suitable for all applications.
Universal Medium - A water based medium which gives a creamy, slow drying colour mixture and is best suited for hand painting.
Water - Underglaze powders can added to water. Mixing ratio varies depending on technique.
We recommend adding a little bit of water to the powder first to aid mixing.
Trouble Shooting
Do not apply to thickly as underglaze colours can flake off if overapplied.
Certain colours such as purples, pinks and reds have a burnout temperatures which must be noted to ensure you do not lose certain colours during the glaze firing.
Care must be taken to ensure that tin based colours are not mixed with chrome based colours.
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