reek 
. * . ° 
‘ ‘ 
On ihe Grecian Method of dyemg Cotton Yarn Red. 3 325. 
diftininefs of principle, and may perhaps open a new field 
for faving oak bark in dyeing, as the willows, fallow, afh, and 
others, produce a very fine black. It is alfo worthy of ob- 
fervation, that the quantities of gallic acid and tanning prin- 
ciple do not differ in egual proportions between the winter 
and fpring felled oaks. This faét may lead to the diferimi- 
nation of the proper time for cutting; which is, probably, 
when the fap has completely filled and dilated that part of 
the vegetable intended for ufe. This: will make a difference 
in the feafon of cutting oak, elm, and other trees, fhrubs, &c, 
Leaves fhould be taken when arrived at their full fize, and 
then dried under cover; for, as the tanning principle is fo 
foluble, and the fub{tance that contains it fo thin, (in a i) 
the dew alone might diffolve it. 
Finally, as the gallic acid does not feem to combine ik 
the matter of fkin, and as its aftringency will corrugate the 
furface, we may, I think, conclude, that its prefence in tan- 
ning is not only ufelefs, but detrimental. 
Sen 
IV. Extrad of a Memoir on the Grecian Method of dang 
Cotiou Yarn Red. By C. Fevix*, 
Th AT beautiful red dye given to cotton in the Ottoman 
empire, is known in Europe under the name of Turkey red, 
Levant red, or Adrianople red. As it is believed among us that 
this colour refults chiefly from the proceffes employed in the 
dycing, I fhall give an account of thofe followed in the Gre- 
cian manufactories. It muft, however, be obferved, that im 
thefe manufactories the workmen dye at one time a mafs of 
fkains weighing thirty-five occas; each occa being equal to 
about fifty ounces. 
_ The firft procefs is that of cleaning the cotton, for which 
_.purpofe three leys are employed; one of foda, another of 
‘afhes, anda third of lime. The cotton is thrown into a tub, 
and moiftened with the liquor of the three leys in equal 
quantities ; it is then boiled in pure water, and wathed in 
funning water. 
* From the. Annales de Chimie, No: 92. 
The 
