Into a cask which will contain about 40 galls., put 32 galls. of good common vinegar; add to this 12 lbs. of litharge, and 12 lbs. of white copperas in powder: bung up the vessel, and shake and roll it well twice a-day for a week, when it will be fit to put into a ton of whale, cod, or seal oil, (but the southern whale oil is to be preferred, on account of its good colour and little or no smell:) shake and mix all together, when it may settle until the next day; then pour off the clear, which will be about seven-eighths of the whole. To clear this part, add 12 galls. of linseed oil, and 2 galls. of spirits of turpentine; shake them well together, and, after the whole has settled two or three days, it will be fit to grind white lead and all fine colours in; and, when ground, cannot be distinguished from those ground in linseed oil, unless by the superiority of colour. If the oil be wanted only for coarse purposes, the linseed oil and oil of turpentine may be added at the same time that the prepared vinegar is put in; and, after being well shaken up, is fit for immediate use, without being suffered to settle. The residue or bottom, when settled by the addition of half its quantity of fresh lime-water, forms an excellent oil for mixing with all the coarse paints for preserving outside work. All colours ground in the above oil, and used for inside work, must be thinned with linseed oil and oil of turpentine. Gain by the above process. One ton of fish oil, or 252 galls................ $151.20 32 galls. of vinegar, at 12-1/2 cts. per gall.... 4.00 12 lbs. litharge, at 7 cts. per lb............... 84 12 lbs. white copperas, at 8 cts. ditto.......... 96 12 galls. of linseed oil, at 90 cts. per gall.... 10.80 2 galls. of spirit of turpentine, at 40 cts..... 80 -------- $168.60 252 galls. of fish oil 12 ditto linseed oil 2 ditto spirit of turpentine 32 ditto vinegar --- 298 galls., at 90 cts. per gal. $268.20 Deduct the expense............. 168.60 -------- $ 99.60 535. PAINTING IN MILK