Masonite

A trademark used for a type of fiberboard employed as a surface for painting, but manufactured principally as wallboard for use in insulation, paneling, etc. It is dark brown, with one side that is very smooth, and the other bearing the texture of an impressed wire screen. Gesso is commonly applied to Masonite as a ground. Masonite can be quite permanent. It often occurs in print in lower case, to the dismay of the owner of the rights to this trademark. (Artlex.com)

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