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Black Amber Varnish

hot; mix well, remove the vessel from the fire, and, when cooled a little, add the turpentine, also made warm. Each of the above two varnishes should be reduced to a proper cooled upon a glass plate. If, on cooling, it is limpid and wax-like, penetrable with the nail without cracking, the proportion of oil is sufficient; if, however, it is hard and brittle, more oil is required. Some resins absorb consistence with more turpentine if it be more oil than others. The spirits of turpen- required. The last form produces the beautitine should be heated, and added in a thin ful black varnish used by the coachmakers. stream to the oil and resin while still hot. Some manufacturers omit the whole or part Care must be taken not to add the turpentine of the asphaltum, and use the same quantity while the mixture is too hot, as too much of of clear black resin instead, in which case the the turpentine will be lost by evaporation; color is brought up by lampblack reduced to but if the mixture gets too cool it becomes an impalpable powder, or previously ground sticky, the addition of turpentine must be stopped, and it must be replaced over the fire and heated gradually up to 600°. Limpidity is thus restored, and, upon removal from the fire, sufficient turpentine should be added to impart the proper consistence; but this extra heating injures the quality of the varnish.