Chrome
(Potassium dichromate. Bichromate of Potash.)
Chrome is a modern mordant, unknown to the dyer of fifty years ago. It
is excellent for wool and is easy to use and very effective in its
action. Its great advantage is that it leaves the wool soft to the
touch, whereas the other mordants are apt to harden the wool. The wool
should be boiled for 1 to 1-1/2 hours with bichromate of potash in the
proportion of 2 to 4 per cent of the wool. It is then washed well and
immediately dyed. Wool mordanted with chrome should not be exposed to
light, but should be kept well covered with the liquid while being
mordanted, else it is liable to dye unevenly. An excess of chrome
impairs the colour, 3 per cent of chrome is a safe quantity to use for
ordinary dyeing. It should be dissolved in the bath while the water is
heating. The wool is entered and the bath gradually raised to the
boiling point, and boiled for 3/4 of an hour.
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Alder Bark
The bark and twigs of alder are used for dyeing brown and black. For 1 lb. wool use 1 lb. alder bark. Boil the wool with it for 2 hours, when it should be a dull reddish brown. Add 1/2 oz. copper as for every pound of wool for black. ... Alum
This is the most generally used of all the mordants, and has been known as such from early times in many parts of the world. For most colours a certain proportion of cream of tartar should be added to the alum bath as it helps to brighten the ultima... Appendix
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