Taint. - In February 1799, a patent was granted to Mr. Joseph Tidmarsh, for his invention of a compound, which may be either substituted for paint, or be mixed with other pigments, for enlarging their quantity, or reducing their price. The patentee directs the following articles to be pulverized, namely ; glass, burnt clay, the slag of glass, copper, iron, or other manufactories ; marble, spar, flint, or similar vitrefiable or calcareous earths. The powders, thus, obtained, may be employed as a paint with the liquids commonly used in mixing colours; or they may be immediately incorporated with any kind of paint.
M. Darcet has found, that the succeeding ingredients and proportions form an excellent white paint, that may be generally substituted for oil-paint, without producing any of its numerous inconveni-cncies:
Slacked lime - - 1/4 oz.
Whiting - - - - 10 oz.
Fine pulverized charcoal 1 dram.
Water - - - - - 3 oz.
The following preparation, how-ever, appears to be more simple, and is equally efficacious: it was first published in the "Bibliotheque Physico-economique, "' for 1792, by M. Ludicke; who has employed it with great success for painting ceilings, gates, doors, and even furniture. He directs fresh curds to be bruised in an earthen pan, or in a mortar; after which they must be mixed with an equal portion of slacked lime : the result will be a white fluid, that may be applied with as much facility as varnish ; but it will be necessary to employ such mixture on the same day, as it dries very speedily, and is apt to become too thick, if it be kept 24 hours. - He observes that Armenian bole, ochre, and all pigments that are miscible with lime, may be incorporated in various proportions, according to the colour to be communicated ; but some caution is necessary, in making such addition, to use the smallest possible quantity of water ; as the painting will otherwise be less durable.
When two coats of this paint have been applied, it may be polished with a piece of woollen cloth, or other proper substance ; in consequence of which, it will become as bright as any varnish : and, if the ceiling, etc. be exposed to moisture, it should be coated with the whites of eggs ; by which expedient it will become as durable as oil-painting. The principal advantages, derived from the use of this substitute, consist in its cheapness, and the facility with which the two coats may be applied, and polished; one day being sufficient for both operations. Hence, it deserves the attention of those whose lungs cannot support the disagreeable smell arising from oil-paint; and who are not disposed to encourage the extravagant charges of house-painters.