for Hats or Helmets of Felt, Gaiters, 8c. 5 
both crust and crumb, of the size of a small loaf. Coyer 
it, and let it cool for 24 hours. The oil thus prepared is 
made use of for various purposes. 
Composition of the Black Varnish. 
1. Take of black umber 2 pounds 13. ounces ; cut it into 
small pieces, and place them in a frying-pan, upon a very 
brisk fire, and roast it like’ coffee for about three quarters of 
an hour; bruise it afterwards upon a marble slab, by mixing 
it in the manner of painters, with a little boiled linseed oil, 
and keep it in a stone pot. 2 
2, Take three pounds of verdigrise; reduce it to an im- 
palpable powder; mix it with the boiled linseed oil; then 
put it into the stone pot which contains the umber. 
3. Take of lamp-black one pound, mix it also with boiled 
linseed oil, and after putting it also into the stone pot, blend 
the whole well together. 
This is the mixture made use of to varnish articles of felt, 
cloth, or leather, observing that when leather is to be var- 
nished it is essential to give it previously two or three, and 
sometimes even six coats of linseed oil; it must be well dried 
each time, in order to extract the grease from the leather, 
wax, or fish oil, in order that the varnish may’ incorporate 
with the leather more easily. This precaution must be made 
use of with soft boots, when placed upon moulds or. boot 
trees; and, without even taking them off, as many coats of 
varnish may be laid on .as necessary. 
Method of preparing the Varnish. 
Take of Prussian blue - 12 ounces. 
Indigo ei nate we 
Bruise these two separately upon a marble’slab; mix them 
up with a little oil, and put them in a pot by themselves. 
Afterwards take of gum-copal - 8 ounces. 
Prepared nut oil 5 
Spirit of turpentine 14 
Put the gum-copal, bruised in a matrass with a large neck, 
upon a strong fire, but not flaming, taking care to stir it 
often, and to keep it uncovered. We know that the gum 
A3 is 
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