Martin’s Moveable Feast – Clear Black-GrayFiring temperature : cone 10 | Surface texture : glossy | Color : black | Atmosphere: Oxidation/Neutral
Published in "Andrew Martin's Aquatic Aesthetic" by Glen R. Brown, in the Jan 2011 issue of Ceramics Monthly.
The variety of fluxes in this glaze help to promote a wide range of colors. In order to get French Chartreuse, Maroon, Orchard Purple, and Aegean Blue, this exact recipe should be followed. Some of the other colors can be made by substituting strontium carbonate for the barium (removing barium and using 18.5% strontium carbonate total). Do small tests to see if the colorant combination you want to use responds well to this change.
Originally, this was a cone 10 glaze, but it can be fired to cone 6 with a 30 minute soak (effectively a cone 7 1/2 firing), and still achieve glossy results.
Dripping is the best method for applying this glaze, as pouring and spraying can lead to uneven coatings, resulting in prominent lines on the finished work.
At cone 10, the glaze is more fluid, so be sure not to apply it too thickly (not more than the thickness of a dime), and wax 1/8 to 1/4 inch up from the foot or base of your piece.
Bright colors can be achieved over a white surface. The color of your clay will dramatically affect the color of the finished, fired glaze.
The glaze has a tendency to crackle or craze over many clay bodies.
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