The Dyer's Guide. Chapter IV. On Scouring and Dyeing Wool. A chemic vat for blue woollen. To dye wool orange, gold colour, &c.

The Dyer's Guide
Being a Compendium of the Art of Dyeing
Linen, Cotton, Silk, Wool, Muslin, Dresses, Furniture, &c. &c.
With The Method of
Scouring Wool, Bleaching Cotton, &c.
And
Directions for Ungumming Silk, And For Whitening And Sulphuring Silk And Wool.
And Also
An Inttroductory Epitome of The Leading Facts in Chemistry, As Connected With The Art of Dyeing.

By Thomas Packer,
Dyer and Practical Chemist.

"Cet arte est un des plus utiles et des plus merveilleux qu'on connoisse."
- Chaptal.

"There is no art which depends so much on chemistry as dyeing."
- Garnett.

Second Edition,
Corrected and Materially Improved.

London:
Printed for Sherwood, Gilbert, And Piper,
Paternoster-Row.
1830.
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 helow 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, having archil out. See buff, peach, &c. on wool.