Incessant
watchfulness both day and night is required to detect the critical
moment. With the less delicate skins this bran bath is not necessary.
Lime and acid solutions accomplish the same purpose. When the gelatine
matter is all removed the skins are ready for the actual curative
process.
Oil dressing or Indian dressing--which merely differ in application,
but are founded upon the same principle--is the most simple method of
curing skins. The principle of each is the soaking of the gelatine
fibers of the skin with oil, the union of the latter and the gelatine
appearing in the form of oxide, and resulting in the insoluble,
undecomposable, pliant, and tough material known to the commercial
world as leather. The first step in the oil dressing, after the skins
have been duly soaked to render them porous and absorptive, is to
cover them with fish oil and place them in the stocks or fulling
machines--huge wooden hammers with notched faces working in iron
cases--where they are beaten and turned, and subjected to a uniform
pressure until the oil is gradually absorbed. After taking them out,
hanging them up, and stretching them, the oil and fulling process is
repeated according to the thickness of the skin, and until every part
of it is full of oil.
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