—— See 
ee Se 
Method of preparing Inks, &d. 353 
€éftaining the faét, that is, the low price at which cotton 
is bleached in all thofe manufactories where this procefs is 
ufed. In the fouth of France, where this method is at 
prefent pretty getiérally adopted, eighty pounds of cotton 
are bleached for about feven fhillings fterling. This procefs 
. was brought to us from the Levant fome time after the in= 
troduction of the procefs for dyeing the Adrianople red. It 
has been practifed for fome time, but kept a fecret till the 
efent moment, and flill known by the name of blanchimont 
& la fumée, bleaching by fmoke. 
I do ttot know that this method has been applied to the 
bleaching of fpun flax or hemp. It would, however, be worth 
while to try the experiment: ftronger leys and longer ebul- 
lition, no doubt, muft be employed; but it is by experience 
alone that we can acquire information on the fubje&. 
VILL. On the Method of preparing Inks that will withftand 
the AGiion of the Onygenated Muriatic Acid. By A. Bossn, 
of Hamburg *. 
INTRODUCTION. 
For illuftrating the hiftory of this fubje&t, which has 
been fully treated of in the New Hanoverian Magazine, 
the followmg information may be neceffary :—Dr. Lentin, 
in his paper containing cautions in regard to the mifapplica- 
tion of the oxygenated muriatic acid}, obferved, that with 
the help of this acid owr common ink could be obliterated 
without the leaft injury to the paper which had been written 
with it, if the paper were firft-drawn through diluted oxygen- 
ated niuriatic acid; then through diluted fulphurous acid; 
and laftly, through water. At the fame time he added fome 
mformation which feemed to prove that this property had 
been employed in France feveral times to anfwer private pur- 
pofes, and to the prejudice of others. Soon after appeared a 
* From Scherer’s Algemeines Journal der Chemie, Vol.Il. No. 10, 
The Introduétion is by Dr. Scherer. 
+ Hannov. Mag, 1797, part 71- 
Var. Y. Za paper 
