Already from the beginning, the Italian tin-glaze ceramics had a decorative function. Underglaze is a method of decorating pottery in which painted decoration is applied to the surface. The greyish cobalt-oxide was applied to the biscuit baked pottery of. 1575, underglaze-painted stonepaste Royal Ontario Museum DSC04735. I can’t guarantee I’ll succeed, but I’ll try. Japanese porcelain Hirado ware paperweight with chrysanthemums and plum blossoms, underglaze blue and brown, 19th-century. But for the other 5,900 pots I make per year, my goal is to eliminate cobalt entirely. Save 10 on Eclipse Clay with code SOLAR10. Online and at 35 S Hanford St, Seattle, WA. Serving the pottery community since 1975. Some of my pottery will still require cobalt, like the Neptune Mugs, which I make about 100 of per year. Manufacturer of kilns, clay, and glaze, and full-service retailer of pottery supplies. Oil Spot Black, Cone 6-10 Silica 325 mesh Here is the exact glaze recipe for my Cosmic Mugs, with how much cobalt I use today. I typically use 0.1 in the top row of my blends. Higher amounts may give metallic results. For example, if the recipe calls for 1 cobalt oxide and cobalt carbonate is being substituted, use 1.5 cobalt carbonate. Very strong, use in amounts of 3 or less. Tends toward purple in the presence of magnesium in a base glaze. Those include any pot that has my custom “Oil Spot Black” glaze, specifically the “Cosmic” glossy black pottery, including all Cosmic Mugs and Moon Mug interiors for . Buy Cobalt Oxide online from Mid South Ceramics or browse our full range of pottery tools, equipment & supplies online. Cobalt oxide (CoO)/Cobalt carbonate (CoCO 3): A very little goes a very, very long way. For those pots, I’m working to reformulate my custom glaze chemistry to eliminate cobalt, but maintain beautiful blue colors. There is also pottery that contains cobalt that I’m not able to discontinue today. I will try to reformulate glaze chemistry to get blue without cobalt, but it’s unlikely I’ll succeed. I’m discontinuing this pottery, effective immediately, until further notice:
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