This has hardly a place on an oil color list, yet it belongs properly to the group of black pigments. Years ago we only had the natural mineral at our command, but for some time it is produced also by artificial means. By this we refer to the product of the Acheson Graphite Company, who claim that this is purer by far than the purest natural graphite. The Acheson graphite, it is claimed, contains 94 per cent pure carbon, the balance being silicious matter with traces of alumina and iron. There are, however, offered to the trade natural graphites containing 90 per cent or a trifle over of carbon, and it is really a question of choice for the color grinder, unless the artificial product is specified. The natural graphite with 90 per cent of carbon averages about 2.5 specific gravity, while the artificial is not above 2.25. Either of these will require about 45 per cent of oil, or say, forty-five pounds oil to fifty-five pounds pigment to form a paste. The artificial pigment does not hold well in suspension, is very apt to cake hard in bottom of container - much more so than the natural graphite. To hold the pigment in suspension an inert extender, such as asbestine or a bouyant clay, is beneficial, the only drawback being that graphite of itself has not a great deal of opacity. When not tied down by specifications the color grinder or paint maker can remedy this deficiency in body or hiding power by the addition of lampblack, especially when, as it is often the case, black graphite is called for.