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Show CANVAS LASTS TWICE AS LONG I Treatments Double Life of Fabric Exposed to Weather . WASHINGTON". Aug. 26 By The Associated Press) Those who use heavy canvas covers to protect their crops. machinery. materials, etc.. against the weather, can almost double the life of the fabric If they treat them to afford protection ug.ilnst lisht as well as moisture and mildew, the department de-partment of agriculture, declares in a recent circular. After a series of experiments ex-periments with canvas, in which waterproofing wa-terproofing mixtures were made with, the- addition of earth pigments such as used in paints, the experimenters arrived at the conclufcion that keeping out the light from tho inner fiber affords af-fords considerable protection to the fabric. j Since s.-veral pigments are auVtabh there Is more or less freedom of choice as to color, thp statement continues. F'or a buff or khaki color, yellow or ochre can bo used. For a darker buff or light brown, raw sienna, is good, for dark red or reddish brown, burnt sienna, si-enna, for olive brown, raw umber and for dark brown, burnt umber Is added to the mixture. MAKING VFERPROOF The usual formulas for waterproofing waterproof-ing canvas may be used with the addition ad-dition of fthe earth pigment, using one pound either dry or ground Unseed oil. to each gallon of the prepared solution. solu-tion. The department experts have also found that a solution of dark or yellow yel-low petrolatum (vaseline), beeswax, gasoline and kerosene with the desired pigment, makes a ffooil waterproofing and Ughtprooflng mixture,. Another recipe Just as good Is the same as the first, substituting asphalt (petroleum or bermu(lf-7 i for the be. -.-.wax. The waterproof ing or llghtprooflng of canvas is Important for the number of uses, it Is explained. The Introduction Introduc-tion of long distance truck hauling has created a greater demand for stoui wagon covers, which are widely used, great quantities .are used for covers to protect grain or hay in tho shock from the weather; the merchant uses covers to protect his produce; contractors and builders need them to protect machinery ma-chinery and materials. The army and nay use great quantities quan-tities of canvas and the summer camper camp-er Is another Large f-onsuiner. It is often possible for Ihesc users to halve tIip cost of their convas by prolonging the life of the material. 6mi FENIXC Mix V! s;i i Kor canvas that remains in a fixed position, such as permanent wagon covers, the circular adds, boiled lin-.1 lin-.1 oil containing one pound of th1 d sirefl pigme nt, to each gallon, may j be used The treatment, howver, stiff -lens the canva.s and Is, therefore, not: suitable for covers that are frequently folded. I-ampblack was found in be one of' the best protective pigments for use with linseed oil, giving the1 moot flexible coating. Aluminum bronze powder, and, for n white color, col-or, zinc oxide, also are good, but the latter stiffens the canvas more than any of the other pigments tried. |