To dye wool GREEN.
The shades of this colour are very numerous, as yellow green, pale green, bright green, grass green, laurel green, olive green, sea green, parrot green, cabbage green, duck's-wing green, &c.
The goods must first have a blue ground from the woad vat, light or full according to the pattern, they are afterwards to be prepared with alum and tartar, weak or strong according to the lightness or fulness of the pattern, and are afterwards dyed in weld liquor. Many of the shades of green are more readily done by dyeing the wool first yellow with old fustic, with a preparation of alum and tartar, and using the chemic blue vat made with sulphuric acid and indigo. See page 47.
A chemic vat for GREEN WOOLLEN.
Prepare in the manner described for cotton (page 52.), eight ounces of indigo and four pounds of sulphuric acid. This preparation need not, however, be neutralized for wool as described for cotton. In some instances the preparation is to be for the yellow of fustic one-twelfth of alum, the same quantity of tartar, and in some cases one-twelfth of alum only.
A chemic vat for BLUE WOOLLEN.
This is to be made the same as for green; it need not be neutralized as for cotton. For blue, however, twelve ounces of indigo are necessary to four pounds of sulphuric acid. In dyeing the heat must be much under boiling, or the using of a high heat would give the blue a green tinge. This blue colour is very bright, yet not fast, but no preparation is of any advantage to either its fastness or brightness. Some put alum and tartar, and some use one, and some the other, to prevent a green cast: if, however, the wool be fine, white, and worked much below the boiling point of heat, it will not turn green although neither be used.
To dye wool ORANGE, GOLD COLOUR, &c.
The processes of crimson, scarlet, and of yellow united produce the various shades of these colours, leaving archil out. See buff, peach, &c. on wool.