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Artists' Drying Oil

Mix nut or pale linseed oil with about an equal measure of snow or powdered ice, and keep it for 2 months at a freezing temperature. 2734. Boiled Oil Specially Adapted for Zinc Paint. Mix 1 part binoxide of Drying Oils and Dryers. manganese, in coarse powder, but not dusty, All the fixed oils have an attraction with 10 parts nut or linseed oil; keep it gently more or less powerful for oxygen; and, by heated and frequently stirred for about 30 exposure to the air, they either become hard hours, or until the oil begins to turn reddish. and resinous or sour and rancid. Those The oil thus prepared will also answer for any which exhibit the first property in a marked paint.

House Painting. The follow- 2735. New Drying Oil without Boil- 2744. Massicot. Yellow protoxide of ing. Mix with old linseed oil (the older the lead. The dross that forms on melted lead better), 2 per cent. of its weight of manganese exposed to a current of air, roasted until it borate (this salt is readily prepared by precip- acquires a uniform yellow color. Used as a itating a solution of sulphate of manganese with pigment, and in glazing. (Cooley). a solution of borax, wash the precipitate, and dry it either at the ordinary temperature of the air or at 100°), and heat this mixture on a water-bath; or, if you have to work with large quantities, with a steam-bath to 100°, or at most 110°; you thus obtain a very excellent, light-colored, rapidly drying oil; by keeping the mixture stirred, that is to say, by always exposing fresh portions to air, the drying property of the oil is greatly promoted. The rapidity of the drying of the oil after it has been mixed with paint, on surfaces besmeared therewith, does not simply depend upon the drying property of the oil, but, in a very great measure, upon the state of the atmosphere-viz., whether dry or moist, hot or cold-the direct action of sunlight, and the state of the surfaces rust. For paper and canvas, a coat of size on which the paint is brought. Really genuine boiled linseed oil, if well prepared, leaves nothing to be desired as regards rapidity of drying, but it is retarded by various substances which are added in practice, among which, especially, oil of turpentine is injurious. ing directions are obtained from a thoroughly practical source, and will be found useful both to the amateur and the workman.