2. A shorter liming than the above by the three-pit system. This saved
time (taking 9-10 days), saved hide substance, and ensured greater
regularity of treatment. The limes were about as mellow, but a little
sulphide (2-4 ozs. per hide) was used to assist the depilation,
especially during the short-hair season. These goods were also bated.
3. A distinctly longer liming, 15-16 days, in mellower limes. This
differed from Type 1 also in the respect that greater regularity was
ensured by the three-pit system; a foot or two of old liquor was used in
making up the new lime. More hide substance was lost than in either of
the above processes, but this was deliberate, the object being to
dispense with bating, which is always light for harness hides. Thus a
longer and mellower but systematic liming was used as a substitute for
shorter liming and bating. No sulphide was used in this process.
4. A short liming of 6-7 days, using up to 12 ozs. of sulphide per hide.
The object here is to save time and hide substance. The three-pit system
is preferred. Bating again becomes necessary, but the pigeon-dung bate
is replaced by artificial bates, less objectionable, quicker, and more
scientific in management.
5. A still shorter process of about five days, using still more sulphide
(about 16-20 ozs. per hide), together with some calcium chloride to
reduce harshness. In such a method there is a tendency to revert to the
one-pit system, which involves rather less labour. The three-pit system
shows to a great advantage in the longer processes of liming when the
process is reduced to five days; there is little difference between the
two, for a one-pit system is a two-liquor method. Hence again an
artificial bate is used.
The various methods of liming, together with analogous variations in
tannage, have resulted in great variety in bating. Sometimes up to three
days' bating has been given at 70° F., but more often the goods are
merely immersed overnight, and then delimed with boric acid, but with
sulphide processes it is an advantage to use some of the commercial
bates of the ammonium chloride type, and finish off with boric acid.
Scudding is always more thorough than for sole or belting, the hides are
rounded into long butts which include most of the shoulder "harness
backs." The goods are sometimes bate shaved.
A few tannages will now be outlined, in order of historic type.
Public-domain text, read in full here on John Shaqi.
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