Scowering different Kinds of Stuff. 263 
- It is employed in vapour; its action is fpeedy, and feldom 
alters the colour. 
The means of removing greafy fpots are well known. 
_ This effeé& is produced by alkalies, fullers’ earth, volatile oils 
diffolved in alcohol, a heat proper for volatilizing greafe, &c. 
Spots occafioned by ink, ruft, or iron-mould of any kind, 
and ail thofe produced by the yellow oxyd of iron, are re- 
moyed by the oxalic acid: the colour may be reftored by al- 
kalies, or a folution of the muriat of tin. Thefe fpots may 
- be removed alfo by the oxygenated muriatic acid, when they 
_ are on white ftuffs or paper. 
» The aétion of alkalies, and that of perfpired matter, are 
the fame: their fpots may be effaced by acids, or even by a 
weak folution of the muriat of tin. When thefe fpots arife 
from feveral unknown caufes, i order to deftroy them re- 
courfe muft be had to polychreff compofitions. The following 
may be confidered as one of the moft efficacious. Diffolve 
white foap in alcohol, and mix this folution with the yolks 
of from four to fix eggs: add gradually effence of turpen- 
tine ; and incorporate with the whole fome fullers* earth, in 
fuch a manner as to form balls of a fuitable confiftence. 
Moiften the fpot; and, having rubbed it with thefe balls, 
‘the fpot will be removed by wafhing the ftuff. All fpots, 
except iron-mould and ink, may be removed in this manner. 
Wathing deftroys the luftre, and leaves a tarnithed place 
_difagreeable to the eye; but the luftre may be reftored by 
drawing over the wafhed place, and in the direction of the 
pile, a bruth moiftened in water impregnated with a little 
gum. ‘You may then apply a fheet of paper, or a piece of 
sloth, and a confiderable weight, under which the cloth muft 
_ be left to dry. 
IX. Defcrip- 
