COATING FOR BLACKBOARDS.
A writer in the Scientific American says : —Being a teacher, I give you my experience in making a blackboard with velvety surface. It is as near perfection as can be ; I have used it for years. Take equal parts by weight of Prussian blue, powdered, and of chrome green, powdered ; mix well. For liquid, use gilders’ sizing (solution of shellac in alcohol), thinned with one-half of alcohol ; mixed with part of combined dry powder to the thickness of cream. Use large and stiff brush ; cover quickly. In a day or two smooth the surface with haircloth. This covering will never look gray, as that with lampblack will.
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Wairoa Bell, Volume V, Issue 176, 16 December 1892, Page 6
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110COATING FOR BLACKBOARDS. Wairoa Bell, Volume V, Issue 176, 16 December 1892, Page 6
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