The Fairmont West Virginian. (Fairmont, W. Va.) 1904-1914, 1907-09-03
MAKING 0F Glue
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sGlue Is not definite! positive Or.
gantc substanee AZ most people sup;
pose Chemists tell US that glue does
not pre.exist in any animal organism
except under abnormal conditions
as in disease-but is the product Of
several transformations.
The first Transformation takes place.
in drying the hide II a green hide is
boiled after being prepared In exact
" the same manner by lining. etc.,
while IT is yet green, an entirely DIFF
terent product Of less consistency is
secured than bydrying the hide after
lining and then boiling.
The second transformation seems to
take place in boiling the material,
probably from action OF the heat. The
third transformation occurs in the dry
Ing of the Jelly secured in the boiling
operation. still another TRANSITIONAL
ton occurs in the drying of this Jelly
into actual glue, and this series OF
changes does not end here, for glue
dissolved in water and again boiled
sufficiently long loses its form once
more and will not gelatinize, but will
remain in liquid form.
Glue yielding substances are pro.
duced by the animal economy from
proteine bodies albumen, fibrine and
caseine. The impossibility of pre-
serving for any length Of time the
stock from. which glue is made rem
ders it necessary to adopt some sys'
TEN in choosing and preserving 1t I'M
til sufficient quantities are collected
without fermentation or decomposi'
ton. Hence the refuse from tanner
les, consisting Of the clippings OF
hides, ear and tall pieces of OK, calf
and sheep, and from skins Of other
animals are preferred, because they
can be dressed with lime; which re-
moves the hair and acts as an anti
septic.
The ordinary bone stock glue is
made from the larger bones or cattle
and horn piths, collected from differ
ent sources. A large quantity Of waste
bones is accumulated in the prepara
ton of tinued provisions.
II these have not been overheated
and are in good condition a consid
cradle amount Of glue can be obtain
ed from them. The bones from the
head, ribs and feet, give better yield
than those of the thighs and legs.
There is also the hoof glue, which
Is made from the hoofs of different
animals. Then there is glue made
from sinews and fleshlngs, and also
a grade known as rabbit glue made
from the skins of hares and rabbits
This glue makes a good water test
but should never be used to cement
q belt. There Is a large quantity oil
this glue made in this country, and a
person not very familiar with It could
easily be received.
The age of animals yielding glue
stock has an important influence or
the product. While from younger ami
mails the production, as a rule, is OF
a lighter color, more abundant and
more easily obtained, 1t contains more
hohdrin, so that for solutions Of equal
strength those from nature animals
will be found to be of the greater con
slstency and the glue more solid.
Then, again. there is what Is known
as the pig stock glue, which is made
from the feet of hogs. Next comes
the flesh glue or isinglass. Its varie
ties are numerous, and thorough
knowledge of them can only be obtain
ed when one is personally acquainted
with the different factories and stocF
from which they are made.
The best Of this material, however
is made from the sounds or air bad
ders of the different species Of fish
The air bladders of the common stur
geon and other fish caught in norther
IL climates make the hest.