474 XII. CONSISTENT AND DRY COMPOUNDS.— 



and alkalies, the infusion or tincture being reddened by acids, and 

 rendered green by alkalies. 



Florey blacky Floree (Tlnde. The dried scum of the dyer's woad 

 bath, which is prepared by diluting woad with water, adding some 

 slaked lime, and keeping the liquor warm when it ferments and 

 throws up a blue froth. It is remarkable, that although the fer- 

 mented bath is red, cloth dipped in it comes out of a green colour, 

 which turns, as it dries, to a blue. 



Florence lake, Lacca Florentina. Pearl ashes 1 oz. ^iv, water 

 q. s., dissolve ; alum. Rom. 2 oz. 3iv, water q. s., dissolve : filter 

 both solutions, and add the first to the alum solution while warm, 

 strain, mix the sediment upon the strainer with the first coarse 

 residuum obtained in boiling cochineal with alum for making car- 

 mine, and dry it. This lake is an excellent glazing colour ground 

 with linseed oil, and used with drying oil ; having little body it 

 may be mixed with Indian red. 



Drop lake, Lacca in fjlohuUs, Make a magistery of alum, as in 

 making Florence lake ; boil Brasil dust 1 oz. 3iv, in water 3 pints ; 

 strain, add the magistery or sediment of alum to the strained liquor, 

 stir it well, let it settle, and dry the sediment in small lumps. 



Fine madder lake, Lacca columbina, Dutch grappe madder, 

 (that is, madder root ground between two millstones a small dis- 

 tance apart, as in grinding pearl or French barley, so that only the 

 bark, which contains the most colour, is reduced to powder, and 

 the central woody part of the root left) 2 oz., tie it up in a cloth, 

 beat it in a pint of water in a stone mortar, repeat with fresh 

 water, in general 5 pints will take out all the colour, boil, add 

 alum 1 oz., dissolved in a pint of water, then add oil of tartar 1 oz. 

 and a half, wash the sediment, and dry ; produces half an oz. 



Lac lake, Lac colour, East Indian cochineal. Fresh stick lac, 

 boil in water impregnated with subcarbonate of soda, and add a 

 solution of alum, which throws down the lake equal to l-5th of 

 the lac. It requires about four times the quantity to produce a 

 dye equal to cochineal. 



Lac dye. Preparation unknown, softens in water, and contains 

 less colouring matter than lac lake. 



Orange lake. Best Spanish annotto 4 oz., pearl ashes lib., 

 boil in 1 gall, of water for half an hour, strain, dissolve, alum lib. 

 and a half in water 1 gallon and a half, strain, and add the 

 coloured liquid as long as any sediment falls, strain, and dry the 

 sediment. 



Red and purple lakes may be prepared from red dulse, cochineal, 

 and kermes berries, and yellow lake from turmeric, by boiling them 

 in water, or steeping them in spirit of wine, straining, mixing the 



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