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Mix white lead, stone-ochre, and a little vermilion. Mix lamp-black and Spanish brown. On account of the fatness of the lamp-black, mix some litharge and red lead. Mix umber, yellow ochre, and white lead. The variety of shades of brown that may be obtained, are nearly as numerous as those of green.
If then there is litharge in either of these glasses of wine, the acid holds the litharge in solution. When I pour into it an alkaline solution, the acid will be forced to set the lead free in order to combine with the alkali. The lead, no longer held in solution, will reappear, the liquor will become thick, and after a time the lead will be deposited at the bottom of the glass.
Take of pulverised sand stone sifted fine, 20 lbs., litharge 2 lbs., mix both well with linseed oil to the consistency of paste; brush both broken parts over; press them snugly together, and let them dry, this forms an excellent cement. For taking stains out of cloths, &c.
The combustible metal that is, the lead and the part that will oxidise, are thoroughly oxidised; the litharge would flow out in a fused state into a vessel placed to receive it, and the platinum remains behind. Here is the process which Deville adopts for the purpose of casting off the lead, after he has got out the platinum from the ore.
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
Take white for your first coating, light blue for the second, and dark blue or dark green for the third. When sea-salt is made into a paste with litharge, it is decomposed, its acid unites with the litharge, and the soda is set free.
Observe the fumes that rise from it; and even if it was so far enclosed from the air that you could not form any litharge, you would still have those abundant fumes flying off. I may also take a piece of gold, and shew you the same thing. I have here a piece of gold which I put upon a clean surface of Paris limestone.
The product of the calcination of equal parts of lead and tin 2 parts, carbonate of soda 1 part, antimonic acid 1 part, rub together, or triturate, and melt. Litharge 18 parts, sand 4 parts, oxide of antimony 2 parts, sienna earth 2 parts; melt. If it is too deep the proportion of sienna earth may be decreased. Chromate of lead 1 part, minium 3 parts.
Put 48 lbs. asphaltum into an iron pot, and boil for four hours; during the first two hours, introduce 7 lbs. litharge, 3 lbs. dried copperas, and 10 gallons boiled oil; add 1/8 lb. run of dark gum, with 2 gallons hot oil; after pouring the oil and gum, continue the boiling two hours, or until it will roll into hard pills like Japan; when cool, thin it off with three gallons of turpentine, or until it is of proper consistence.
VARNISH FOR SILKS. To one quart of cold-drawn linseed oil, add half an ounce of litharge. Boil them for half an hour, and then add half an ounce of copal varnish. While the ingredients are heating in a copper vessel, put in one ounce of rosin, and a few drops of neatsfoot oil, stirring the whole together with a knife. When cool, it is ready for use.
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