DR. C. B. PLOWRIGHT ON BRITISH DYE PLANTS. 
391 
Cornu8 sanguine a. — The fresh ripe berries, with alum, dyed 
wool a distinct but not brilliant yellow. 
Galium verum. — Is a plant capable of yielding several colours. 
The flowers, with alum, yellow ; the rhizome, which is very much 
larger than one would have expected, shades of reddish-brown, 1 
deepened by treatment with potash, and orange. The distinctive 
madder tints were not elicited. It has been stated that the 
allied species, G. a purine , boreale , etc., also possess tinctorial 
qualities. These, however, were not tested. The colouring matter 
is probably ruberythric acid, C.^I l w O u . 
Scabiosa sucoisa. — A not very clear yellow, with alum. 
Hidens tripartita. A by no means abundant plant; gives 
a brilliant orange to wool that has been boiled with the fresh plant 
and then immersed in a solution of alum. 
Antiiemis tinctoria. — As its name would imply, gives a good 
permanent yellow with alum. 
Chrysanthemum skuktum. — The fresh Hower-heads give, with 
alum, a dark yellow, deepened bv alkalies. The tinctorial principle 
is chrysanthemin, C^H^N-jOg. (A. (1. I’.). 
Senecio jacob.ea. — T he whole plant, but especially the Hower- 
heads, gives, with alum, a good fast yellow. This plant is still 
used in the Highlands of Scotland lor producing green with 
indigo. 
Serratula tinctoria. — Gives, with alum, a nice clear yellow. 
Tan acetum vulgare. — A very similar yellow to the above, due 
to tanacetin, C n H 1(1 0 4 . (A. G. I’.). 
Xanthium strumarium. — Although not indigenous, is mentioned 
by Withering. It gives a pale canary yellow of considerable 
beauty, with alum. There is no indication of the property in the 
plant as it grows ; but it is said that the ancients were acquainted 
with it. 
Calendula officinalis — Also in Withering’s list. The Hower- 
heads, in spite of their deep colour, gave hardly any colour at all. 
Empetrum nigrum. — The ripe fruit, with alum, gives shades of 
mauve, rendered bluish by ammonia. 
Calluna vulgaris. — Still largely used in Scotland to impart 
a yellow-brown to wool. The process employed is simple : The 
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