A Text-book of Tanning: A treatise on the conversion of skins into leather, both practical and theoretical. — John Shaqi
A Text-book of Tanning: A treatise on the conversion of skins into leather, both practical and theoretical.Procter, H. R. (Henry Richardson)
Science
A Text-book of Tanning: A treatise on the conversion of skins into leather, both practical and theoretical.
Procter, H. R. (Henry Richardson)
Tanning
The exports from Aleppo (including yellow berries) in 1880 were:--60
tons, 3600_l._, to Great Britain; 322 tons, 19,320_l._, France; 15
tons, 900_l._, Italy; 44 tons, 2640_l._, Austria; 55 tons, 3300_l._,
Turkey; 30 tons, 1800_l._, Egypt; total, 526 tons, 31,560_l._ In
1878, the figures were 673 tons, 38,400_l._ Alexandretta exported in
1879 (including yellow berries):--41 tons, 2460_l._, to England; 299
tons, 17,940_l._, France; 20 tons, 1200_l._, Italy; 25 tons, 1500_l._,
Austria; 87 tons, 5220_l._, Turkey; 6 tons, 360_l._, Egypt; total
478 tons, 28,680_l._ The shipments from Trebizonde by steamer in 1880
were (from Turkey):--47 sacks (of 2 cwt.), 188_l._, to Turkey; 240
sacks, 960_l._, Great Britain; 264 sacks, 1056_l._, France; 103 sacks,
412_l._, Austria and Germany; 26 sacks, 104_l._, Greece; total, 680
sacks, 2720_l._; (from Persia): 25 sacks, 100_l._, Great Britain; 31
sacks, 124_l._, France; 30 sacks, 120_l._, Austria and Germany; total,
86 sacks, 344_l._ Bushire despatched 5000_r._ worth to India in 1879.
Syra sent 248_l._ worth to Great Britain in 1879. Venice exported 1745
tons of gall and bark, value 34,906_l._, in 1879.
The best oak-galls contain 60-70 per cent. of tannic or gallotannic
acid, and 3 per cent. of gallic acid. "Rove" is a small crushed gall,
containing 24-34 per cent. of gallotannic acid. There are many other
varieties of non-commercial oak-gall.
_Chinese or Japanese Galls._--These are vesicular protuberances
formed on the leaf-stalks and branches of the _Rhus semialata_
[_Bucki-amela_], a tree of 30-40 ft., common in North India, China, and
Japan, ascending the outer Himálaya and the Khasia Hills to 2500-6000
ft., by punctures of the female of _Aphis chinensis_. The galls are
collected when their green colour is changing to yellow, and are then
scalded. They are light and hollow, 1-2-1/2 in. long, and of very
varied and irregular form. The Japanese are the smaller and paler,
and usually more esteemed. The galls contain about 70 per cent. of
tannic or gallotannic acid, and 4 per cent. of another tannin. They are
consumed mainly in Germany, for the manufacture of tannic acid.
Hankow exported 30,949 _piculs_ (of 133-1/3 lb.) in 1872; and 21,611
_piculs_, value 136,214 _taels_ (of about 6_s._), in 1874. In 1877, the
total Chinese export did not exceed 17,515 _piculs_. Hankow exported
24,742-1/2 _piculs_ in 1878, and 28,392 _piculs_, 59,614_l._, in 1879;
Pakhoi, 62_l._ worth in 1879; Canton, 3155-1/3 _piculs_ in 1877, 1939
in 1878, 3163-1/2 in 1879; Ichang, 100-1/2 _piculs_, 132_l._, in 1878,
402-1/2 _piculs_, 586_l._, in 1879; Shanghai, 27,659-1/2 _piculs_ in
1879.
In China trade returns, they are always miscalled "nut-galls" or
"gall-nuts": correctly, they are _wu-pei-tze_. Oak-galls are exported
from China resembling those of Western Asia. Japanese galls, _kifushi_,
are sent in increasing quantities from Hiogo.
Public-domain text, read in full here on John Shaqi.
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