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Blue Purple for Wood
One hundred
pounds of wool are first dipped in the blue vat to a light shade, then
boiled in a solution of 15 pounds of
alum and 3 pounds of half refined
tartar, for 1 ½ hours, the wool taken out, cooled, and let stand 24 hours.
Then
boil in fresh water 8 pounds of powdered cochineal for a few minutes,
cool the kettle to 170° F. Handle the prepared
wool in this for 1 hour, when
it is ready to cool, rinse and dry. By coloring first with cochineal, as
aforesaid and
finishing in the blue vat, the fast purple or dahlia, so much
admired in German broadcloths, will be produced. Tin acids
must not be
used
in this color
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