THE YOUNG 
A New Liquid Glue. 
A solution of 1 part of sugrar in 3 parts of water, 
when appledto paper, ^?ives to the latter neither 
lustre nor binding? properties ; but if to the so- 
lution be added i part of slaked lime (calcium 
hydrate), and the mixture, after heating to 
145° to 165° F., be macerated for a few days with 
frequent agitation, most of the lime will dis- 
solve, and the syrupy solution possesses both 
adhesive and glazing properties. If to 12 or 15 
parts of this solution be further added 3 parts of 
lime, in small fragments, the latter will rapidly 
dissolve on warming, and, on cooling, will re- 
main liquid, Avithout losing its adhesiveness. 
According to the quantity of saccharate of lime 
present, the consistence of the liquid glue will 
vary ; but, in all cases, it will have a strong ad- 
hesive power. This liquid glue may be used for 
a variety of purposes, but must not be employed 
in presence of coloring matters, which are de- 
composed by lime, such as Prussian blue, zinc- 
green, etc—Polytech. Notizblatt'. 
Dying Horsehair. 
Horsehair, from its strength and other charac- 
ters, is often very useful in amateur work. 
Black and reddish-brown hairs are easily pro- 
cured, but where other colors are needed we 
must procure nice white hair and dye it. This 
is done as follows : Brown— The hair must first 
be thoroughly cleansed by placing it in a soap 
bath, heated to 133°, for twenty-four hours, and 
moving it about frequently. It must then be 
allowed to lie for twelve hours in a dye bath, 
prepared from a decoction of logwood with lime- 
water at 122°, and then be rinsed and dried. 
Blue, inclining to violet— The hair must first be 
dyed brown, as just given, and then passed 
through water, to which a little of a solution of 
ten and a half ounces of tin in thirty-five and a 
quarter ounces of hydrochloric acid has been 
added, and then washed as in the previous case. 
Blue— The hair must be prepared in a solution 
of two parts of alum and one part tartar, wrung 
out, and passed into an indigo bath, prepared 
with fuming sulphuric acid, and then rinsed and 
dried. Bed- The hair must be prepared by 
placing it for half an hour in a tin salt bath, 
prepared like that for violet blue ; after wring- 
ing it out it must be dyed with Brazil wood, to 
which some alum has been added, by allowing 
it to remain in the dye-bath for twenty-four 
hours, and then rinsing and drying. 
— Bepeated applications to copper or brass of 
alternate washings of dilute acetic acid and ex- 
posure to the fumes of ammonia will give a 
very antique-looking green bronze. 
SCIENTIST. . 39 
Cleaning' Ivory and Marble.— The English 
Mechanic gives the foUowiug recipes: Polished 
marble or alabaster, wlien soiled, may be cleaned 
with a weak lye of potash and soft soap. Muriatic 
acid is the best thing for removing iron stains ; it 
should be applied with a rag, but if used too freely 
or too strong will make the surface rough. The 
following is the best recipe for removing ordinary 
stains from ivory or marble: Dust-lime is mixed 
with the strongest soap-lye pretty thick, and in- 
stantly, with a painter's brush, laid on the whole 
of the marble. In two months' time wash it of£ 
perfectly clean, then have ready a fine, thick 
lather of soap (soft) boiled in soft water; dip a 
brush in it, and scour the marble, not with 
powder, as in common cleaning. This will, by 
very good rubbing, give a beautiful polish. Clear 
off the soap, and finish with a smooth, hard brush 
till the end be effected. 
To Polish Aluminium. — M. Mouray recom- 
mends the use of an emulsion of equal parts of 
rum and olive oil, made by shaking these liquids 
together in a bottle. When the burnishing stone 
is used, the peculiar black streaks first appearing 
should iiot cause vexation, since they do not- in- 
jure the metal in the least, and may be removed 
with a woolen rag. The objects in question may 
also be brightened in potash-lye, in which case, 
however, care must be taken not to make use of 
too strong a lye. For cleaning purposes benzole 
has been found best. Objects of aluminium 
can be electroplated without the least difficulty, 
and Mouray succeeded in imparting to them a 
bright white lustre in passing them successively 
through a weak bath of hydrofluoric acid and aqua 
fortis. The effect thus obtained is said to be quite 
surprising. 
To Remove Nitrate of Silver Staiiis.— Dr. 
Kraetzer, of Leipzig, proposes, as a substitute for 
potassium cyanide in removing stains made by 
nitrate of silver, the following: Ammonium 
chloride, lO grams; Corrosive sublimate, 10 
grams ; Distilled water, 100 grams. Preserve in 
a glass-stoppered bottle. He says that with this 
solution the black stains may be removed from 
linen, cotton, and woolen goods without injury of 
the fabric. It will also remove these stains from 
the skin, but although it is less poisonous than 
the cyanide, it is a corrosive poison. 
Fire-Proof Cement.— No cement that eon- 
tains organic matter, such as oil, glue, etc., can 
resist a low, red heat. For a cement that will re- 
sist any heat above that of melted lead we must 
use materials that are of an entirely mineral 
character. Finely-powdered asbestos, made into 
a paste with silicate of soda, forms an excellent 
fire-proof cement. It hardens quickly, makes 
joints that are steam and gas-tight, and stands 
any ordinary heat. 
