Page:History of the Royal Society.djvu/323

 From all which we may observe, That the whole business of Blacking lies in the Iron, as if the salt of the Pyrites-stone in Copperas served only to extract the same; and withal it seems to lie in a kind of findging and ustulation, such as rapid affrictons do cause: For Allum seems to be of the same nature with Vitriol; and yet in no case that I know of, is used for black colours: And in the black colour upon earthen Ware is made with scalings of Iron vitrified. Note, That where-ever Copperas is used, either Galls, Sumach, Oak Sapling-barks, Alder-bark, Walnut-rinds, Crabtree-bark, or green Oak saw-dust, must be used with it: All which things Physicians call Austere and Stiptick.

'Red-wood must be chopt into small pieces, then ground in a Mill between two heavy stones, as corn is. It is used also in Dying of Cloth and Rugs, and those of the Coarser sort: The colour is extracted with much and long boyling, and that with Galls. The colour it makes is a kind of Brick-colour Red; it holdeth much better than Brasil. The Cloth it dyeth is to be boyled with it: Wherefore only such matters as are not prejudiced by much boyling are dyed herewith.

'Brasil is chopt and ground like as the Red-wood: It dyeth a Pink-colour or Carnation, imitating the colour of Cochineil the nearest: It is used with Allum for the ordinary colour it dyeth; and with addition of Pot-ashes, when it is used for Purples.

'Brasil steept in Water giveth it the colour of Clarret-wine, into which a drop or two of Juyce of Lemons or Vinegar being put, turneth it into the colour of Canary-Sack; in which particular it agreeth with Cochineil. This colour soon staineth, Rh