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Green results from the mixing of blue and yellow in varying
proportions according to the shade of colour required.

Every dyer has his particular yellow weed with which he greens his
blue dyed stuff. But the best greens are undoubtedly got from weld and

The wool is first dyed in the blue vat; then washed and dried; then
after mordanting, dyed in the yellow bath. This method is not
arbitrary as some dyers consider a better green is got by dyeing it
yellow before the blue. But the first method produces the fastest and
brightest greens as the aluming after the blue vat clears the wool of
the loose particles of indigo and seems to fix the colour.

If a bright yellow green is wanted, then mordant with alum after the
indigo bath; if olive green, then mordant with chrome.

The wool can be dyed blue for green in three different ways:--1st in
the Indigo vat, 2nd with Indigo Extract with Alum mordant, 3rd with
logwood with Chrome mordant. For a good bright green, dye the wool a
rather light blue, then wash and dry; Mordant with alum, green it with
a good yellow dye, such as weld or fustic, varying the proportion of
each according to the shade of green required. Heather tips, dyer's
broom, dock roots, poplar leaves, saw wort are also good yellows for
dyeing green. If Indigo Extract is used for the blue, fustic is the
best yellow for greening, its colour is less affected by the sulphuric
acid than other yellows.

According to Bancroft, Quercitron is the yellow above all others for
dyeing greens. He says:--"The most beautiful Saxon greens may be
produced very cheaply and expeditiously by combining the lively yellow
which results from Quercitron bark, murio sulphate of tin and alum,
with the blue afforded by Indigo when dissolved in sulphuric acid, as
for dyeing the Saxon Blue."

"For a full bodied green" he says "6 or 8 lbs. of powdered bark should
be put into a dyeing vessel for every 100 lbs. wool, with a similar
quantity of water: When it begins to boil, 6 lbs. murio-sulphate of
tin should be added (with the usual precaution) and a few minutes
afterwards 4 lbs. alum: these having boiled 5 or 6 minutes, cold water
should be added, and then as much sulphate of Indigo as needed for the
shade of green to be dyed, stirring thoroughly. The wool is then put
into the liquor and stirred briskly for half an hour. It is best to
keep the water just at the boiling point."

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