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Clarified Oil for Varnish

When tions should be well observed, or shocking personal injury may result from their neglect.

În the city, it is hardly worth while to make varnish, unless in large quantities, as there are many stores where it may be had very good, and at a fair price; but in the country, where the freight is an object, and you carnot depend upon the genuineness of the article, it is necessary to be known by the practical mechanic how to make it; when it is availboiled oil is used for making varnish, and a able, it is best to purchase it. The varnish still further clarifying is deemed advisable, it is placed in a copper pan holding from 80 to 100 gallons, and heat gradually applied till the scum rises, after removing which the oil is allowed to boil for about 2 hours, when it is dosed with calcined magnesia, in the proportion of an ounce to every 4 gallons of oil, but durable and lustrous of varnishes, are added by degrees and with occasional stirrings. composed of a mixture of resin, oil, and spirit This being completed, the oil is again boiled of turpentine. The oils most frequently emgenerally sold for varnishing furniture is white hard varnish. il Varnishes. These, the most briskly for about an hour, and then, the furnace being drawn, allowed to cool. When the temperature is sufficiently reduced, it is removed to leaden cisterns, where it is stored till fit for use. 2870. Clarified Linseed Oil for Varnishes. Heat in a copper boiler 50 gallons of linseed oil to 280° Fahr.; add 24 pounds of calcined white vitriol, and keep the oil at the above temperature for 1/2 hour; then remove it from the fire, and in 24 hours decant the clear oil, which should stand for a few weeks before it is used for varnish. ployed are linseed and walnut; the resins chiefly used are copal and amber, and some other gums. The drying power of the oil having been increased by litharge, red lead, or by sulphate of lead, and a judicious selection of copal having been made, it is necessary, according to Booth, to bear in mind the following facts before proceeding to the manufacture of varnish: 1. That varnish is not a solution, but an intimate mixture of resin with boiled oil and spirit of turpentine. 2. That the resin must be completely fused previous to the addition of the boiled or prepared oil. 3.