VI. METALS.— SuB-siSlTs! 



tains 271b. of dry stuff, add lib. of the lime cream, and 7-lOths of 

 a pint of pearl-ash water, at 15 deg» Baume, and grind it as quick 

 as possible in a colour mill. Dissolve ^ lb. of grey sal ammo- 

 niac in 4 pints of water, and ^ lb. of blue vitriol in another 4 pints 

 of water; put the ground colour into a stone bottle, and aad at 

 the siime time the blue-vitriol-water, and the sal-ammoniac water, 

 cork well, wax, and leave it for four days. Turn out four of the 

 bottles into a brandy hogshead, fill it up with water, which renew 

 once a day in winter, and twice a day in summer, for eight times, 

 -tirring up the sediment whenever fresh water is added ; then stir 

 up, and strain. — Cendres hlcues fin en pcite. Put in i" lb. lime 

 cream, and ^ lb. white sal ammoniac. — Cendres hleues no. 1 en pate 

 Use 21b. of lime cream, and ^Ib. of white sal ammoniac. Used 

 in painting paper-hangings, mostly for the ground colour, but is 

 ^oon altered by the sun. — Cendres hleues superfim en pierre. Dry 

 the moist superfine blue on white wood trays. — Cendres hleues 

 fins en pierre. The dried fine moist blue, used as a water- 

 colour. The washings above 10 deg. Baume, are boiled to 40 

 deg. and, being almost entirely muriate of lime, are mixed with it. 

 Those below 10 deg. are used to wash the first sediment, or sul- 

 phate of lime. 



Verditer green. The process for refiners' verditer often 

 miscarries, and a green colour is produced instead of a blue. 



Brunswick green. Dissolve blue vitriol in a large quantity 

 of water, and add spirit of urine, or rough bone spirit, as long as 

 y sediment falls ; decant, wash and dry the sediment ; the 

 uor is used to make sal ammoniac. 



ot 



Rough verdigris, Vert de Grece, Diacetate of copper, JErugo, 

 Viride ceris, Cupri suhacetas. Prepared by putting plates of cop- 

 per into a cask between layers of vine twigs, and moistening them 

 with sour wine; emetic internally, in very small doses; exter- 

 nally caustic ; much used as a paint : from France, composed of 

 10 ox. copp. 6*2.5 ac. and 6*75 water ; equiv. 23. 



English verdigris. By corroding copper with rough pyro- 

 ligneous acid and tartar. 



i^RUGo prefarata. liougli vcrdigris q. p. grind with 

 water ; add more, and pour off the coloured water into another 

 vessel, where let it settle ; then j)our away the water, and dry the 

 sediment, repeating this washing with the remainder, until all is 

 either dissolved or washed over. 



Scheele's green, Arseniate of copper. Precipitate a solution 

 of blue vitriol 21b. in water G gallons^ by a solution of white 

 arsenic lloz., and pearl-ash 21b., in boiling water 2 gallons, and 

 wash the precipitate ; produce lib. 8oz. : used as a paint. 



