Iron County register. [volume] (Ironton, Iron County, Mo.) 1867-1965, 1885-09-10
llNSEED OIL.
How It Is Prepared From the Seed-Ita
Uses in the Trades.

How It Is Prepared From the Seed-Its
Uses in the Trades.
Linseed oil is generally prepared by
cold or warm pressing of faxseed. Its
employment in the manufacture of oil
paints is owing to its drying proper
ties. When spread out in thin layers
it dries and forms solid varnish-like
body. Fresh linseed Oil always con-
tains watery and gummy bodies. from
which it must be separated before bein g
used. The simplest method for purify
ing and clarifying linseed oil consists in
storing it for several months and then
carefully drawing it of from the sedi-
ment. The celebration and oxidation of
linseed oil is due to the absorption of
oxygen from the air, and it is for this
reason that linseed oil should be stored
in Theoretically sealed vessels, if pos
sible in the dark.
When linseed oil is to be used for
paints, its drying properties must be
improved; that is. it must be converted
into varnish. For this purpose two
and half parts of itharge are placed
into an iron or copper boiler with fifty
parts of old clarified linseed oil. The
oil is then carefully heated to boiling.
At the end of about one hour dirty
scum forms on the surface of the
oil, which must be removed as it forms.
Precautions must be taken to prevent
the oil from boiling over. 1t is adyisa-
BILE to have proper cover and wet
cloths at hand for extinguishing the
fire in case the oil should become over
heated. On a large scale, iacketed
boilers heated by steam are used. At
ter the oil has boiled three-quarters OF
an hour, it IS allowed to cool and settle.
At the end of two or three days. some
times after twenty-four hours, the clear
oil is drawn OFF. The linseed-oil warm
ish obtained in this way has pale wine
color, is clear and transparent. and
more viscous than the original oil. 1t
does not froth when poured out and
dries to an almost colorless mass. Lin
seed-oil varnish should be kept in bot.
ties. 1t NAV be ground with various
colors. and used for painting wood,
iron, brick work. etc. Melted together
with resins, especially with copal and
amber, it may be used as waterproof
paint on wood, etc.
TO make a white oil paint, this lin-
seed-oil varnish Is generally ground
with lead; and in case colored paints
are to be prepared, ocher. Naples yell
low, terra de sienna. chrome red, YER
million, etc., are added. When wooden
floors are to be painted. they should be
first saturated with inseed-ol. For
this purpose the Oil should not be used
cold, but always warm. because the
heated oil is more fluid, and penetrates
the wood to a greater depth.
Oil putties generally consist of lin
seed oil. varnish. and litharge, or cal
cined chalk. This putty is gradually
converted into a soap, which is per-
fectly insoluble in water. Its hard
ness may be increased by the addition
of quartz sand or brick dust. In paint
ing. the finest purified and bleached
linseed is often required. Such an
oil may be prepared by treating the
varnish, prepared as above, with a
solution of sugar of lead The sugar
of lead solution is prepared by dis.
solving one part of sugar of lead in
sixteen parts of alcohol; one hundred
pounds of linseed oil are heated to
eighty-fve or ninety degrees, and
then thoroughly mixed with five OF
six pounds OF the alcoholic lead so.
luton. The oil is then left at rest for
three or four days, and the clear,
bleached oil is drawn off from the sedi-
ment. The sediment NAV be freed
from the gummy matterby filtration
Trade Journal