{"newspaper_name": "The Wilmingtonian, and Delaware advertiser.", "edition": "01", "page": "p4", "byline": ""}
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Interesting to Dyers and H6ad Gro,rerS.-A


new method of preparing Doad. for dying in blue,
has been read BY Messrs Robiquct and Colin,
before the Royal Academy OF Sciences at Paiis,


the title of which is "Researches on the colorlng


principle in woad" BY means OF new process.


these chemists have succeeded in obtaining very


expedltiolisy and economically that precious
article, which now sells from fourteen to fifteen
francs an ounce for the purest cakes, which will
very likely soon be obtained by the pound tor
the present price now paid for an ounce. They
designate under the name Of alzarine, the tncto-
rial matter in woad, which they believe 10 have


obtained in its greatest purity by the following


process. Their researches had induced them to


propose the alcoolck fermentation, which olsen
,, cages all heterogeneous substances, which might
impair its beauty, at the same time that It does
no injury to its fine coloring substance But
they now propose the following method, as be-
;np much more expeditions. Grind well the
woad and add two or three parts OF clear water,
! subject the whole to a very strong pressure, re
E neat the same operation three successive times
: bruisc well the residue and suffer it to be thu
v exposed to liquid bath with hive or SIX part
t of water added to it, in which sutheient quan
: tty of alum has been previously dissolved' after
: ward strain well that liquid and precipltate It D.
i an addition of subcarbonate OF SODA Inc pre-


cipitate thus produced must be very caretuil
!, washed in clear water. The naceration IN aiur
: wateris then continued till it become OF a proT
C erly thick consistencc. BY the ABOVE process