Manufacturer and builder 11, 1894
Slate pigment, which is simply slate stone ground and bolted, has become within the past few years quite an important industry; it is now used as a cheap paint. When mixed paints were first introduced it was a scheme of unprincipled manufacturers to add a given quantity of slate dust to the paint in order to make full weight and save lead. It took a number of years for the Yankee genius who manufactured the slate dust for half a cent a pound to comprehend the boomerang side of the case, and realize that he had purchased the same slate dust that he had sold for a small amount at the rate of 16 to 20 cents per pound whenever he had occasion to paint his buildings. Paint made of slate dust is now sold according to its actual merits, and at a corresponding price.
— Stone.
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