. Cyclopedia of farm crops. Farm produce; Agriculture. 628 TANNING MATERIALS TANNING MATERIALS becomes thick and strong, it is decanted into another vessel and the evaporation continued until the extract will set on cooling, when it is poured into moulds made of leaves or clay, the drying being completed by exposure to the sun and air. Kath, or pale cutch, is made by stop- ping the evaporation at an earlier point and allowing the liquor to cool and crystalize over twigs and leaves thrown into pots for the purpose. Good cutch contains about GO per cent of tanning matter, and is principally used
. Cyclopedia of farm crops. Farm produce; Agriculture. 628 TANNING MATERIALS TANNING MATERIALS becomes thick and strong, it is decanted into another vessel and the evaporation continued until the extract will set on cooling, when it is poured into moulds made of leaves or clay, the drying being completed by exposure to the sun and air. Kath, or pale cutch, is made by stop- ping the evaporation at an earlier point and allowing the liquor to cool and crystalize over twigs and leaves thrown into pots for the purpose. Good cutch contains about GO per cent of tanning matter, and is principally used for dyeing browns and blacks with chrome and iron mordants. It contains quercetin, a yellow coloring matter. " Pilang" (^A. leucophlcea) is found in India and Java. The pods and bark contain about as much tannin as A. Arabica. " Golden wattle," or " Broad-leaved wattle" (.4. pyc- nantha), is found in South Australia. It has one of the strongest tanning barks known, containing 30 to 50 per cent of tannin. It has been cultivated successfully in Cal- ifornia and Hawaii. The Golden wattle (.4. longifolia), of New South Wales, contains only half as much tannin SB A. pycnantha. Black wattle (il. moZ/issima), with its two varieties, A. decurrens and A. dealbata, is among the most important of the Wattle family commercially. The bark contains 30 to 50 per cent of tannin and is grown successfully in Natal and in California. Hickory bark (.4. penninervis) contains about 30 to 40 per cent of tannin. , another Black wattle, contains up to 30 per cent of tanning matter, as does also the Weeping willow (A. saligna). The bark of A. prominens contains 14 per cent of tannin. In Natal the Australian wattles (especially A. mollis- iima) have been cultivated with success. The barks con- tain about 30 per cent of tannin. The bark of A. mollis- sima from trees growing on limestone soils contains 10 to 25 per cent less tannin than that from other soil for- ma
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectagriculture, bookyear
