Grain filler does not form a continuous layer over the surface and is not technically a ground. Many different materials have been used to fill the grain of wood before polishing or painting, to prevent the finish sinking, to economize on materials and time, and to prevent grain showing. The use of brick dust is referred to by Sheraton in the Cabinet Dictionary (Sheraton, 1970) as a means of filling the grain partly with the dust itself and partly with wood fibres detached from the surface of the wood. Pumice can be used to the same end. Other materials include plaster, various resins and commercial grain fillers. There are many brands of filler available commercially. These divide into oil based fillers, composed of natural or synthetic resin and tung or linseed oil binders, and those containing a water-based finish (e.g. acrylic) as a binder. In either case, the bound solid is normally silica. An appropriate pigment is normally added to match the colour of the wood being filled.
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