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Fire 04 to 06

Astro Gems are Certified AP Non-Toxic, safe for use by artists of all ages when used according to manufacturer’s directionsAstro Gems are not recommended for dinnerware as they exhibit surface textures such as cracks and crevicesWhile the glazed surface may pass lead & cadmium leach tests, and therefore legally considered Food Safe, attempts to adequately clean the textured surface may cause the underlying porous ware to absorb water and failRecommended for ornamental use only.

Mayco Astro Gems

Mayco Astro Gems

Astro Gems™ are an underglaze-based textural glaze that contains tiny crystals.


Stir and shake for 5-6 seconds before use – you’ll want to make sure the crystals are evenly dispersed in the glaze before applying. Apply 3 smooth, even coats to properly fired shelf cone 04 bisque using a soft brush, such as a CB-604 #4 Soft Fan Brush. Try to get the brush fully saturated (loaded) and apply alternate coats in a perpendicular direction to the previous coat (helps to evenly distribute the crystals on your surface). Fire to shelf cone 06.

AS-510 White Opal Astro Gem can be tinted using Mayco Underglazes. You may find success mixing stains – always conduct small tests before using on a wider scale. Mayco recommends using the darkest color of the Fundamentals Underglaze as the white will lighten.

Crystals to make Astro Gems!

Makes any underglaze into an Astrogem or Sandstar.
Add 1.5 grams to a 2 oz. jar of underglaze, Amaco Velvets or Mayco UGs.