With the exception of such earthy matters as are communicated to it during the preparation, or are added purposely as adulterants, catechu is entirely soluble both in water and alcohol.
Catechu is an extract of the Khair tree or acacia catechu of Bombay, Bengal, and other parts of India.
Lyon Playfair some years back from the catechu bark has been described as exceedingly rich, transparent, and beautiful; and recommended for painting if not too thinly applied.
To make the balls, the woman covers her hands with a little wood ash to prevent the extract adhering to them, and takes up as much catechu as she can close her hands on, and presses it into shape.
Before the commencement of operations, the Kudubis select an Areca Catechu tree, and place a sword, an axe, and a cocoanut on the ground near it.
Failure to produce good balls of catechu is attributed to the wrath of the deity.
As we sell it, the catechu is in the shape of hard round balls covered with a whitish dust, the ashes with which the balls are covered to prevent them adhering to one another.
The contractor has to engage the Kudubis and select the site for the ovens, conveniently situated both for water and firewood, and also as close to the majority of catechutrees as he can get it.
So far as the department is concerned, a locality where there are plenty of catechu trees is selected, and all trees over 6 inches in diameter are allowed to be cut.
In South Canara, one of our most profitable sources of revenue is the extract obtained by boiling the wood of the catechu tree.
The manufacture of catechu is carried out under departmental supervision by a contractor, who is paid on the outturn, and is bound, for the actual boiling, to employ only Kudubis.
Catechu has been recently much employed, in conjunction with copper sulphate, for dyeing the so-called khaki-brown on woollen material for military clothing.
Catechu browns are fast to a variety of influences, e.
On silk, catechu is much used for weighting purposes in dyeing black.
Catechu is largely used by the cotton dyer for the production of brown, drab and similar colours.
The extract is an efficient substitute for catechu and kino.
The brownish-coloured powder vended under the name of 'la veno beno' is a mixture of 2 parts of tea-dust with 5 parts of powdered catechu or terra japonica.
The confections or electuaries of catechu and opium are the representatives of the above polypharmic compounds in the modern British Pharmacop[oe]ias.
The pigment is mutton-fat, blackened, according to Tchebu Lama, with catechu and other ingredients; but I believe more frequently by the dirt of the face itself.
This province is famous for the quantity of catechu its dry forests yield.
The most probable derivation of the name seems to be from the khair or catechutree (Acacia catechu); and it may be supposed that it was the adoption as a calling of the making of catechu which led to their differentiation.
Now that their legitimate occupation of preparing catechu (kath) has been interfered with, they subsist almost entirely by hunting, and habitually kill and eat monkeys, shooting them with bows and arrows.
The latter may be oxidized, and thus rendered insoluble in alcohol, by dissolving the catechu in water, exposing it for some time to a boiling heat, and evaporating to dryness.
Good catechu is a brittle, compact solid, of a dull fracture.
The tannin of catechu differs from that of galls, in being soluble in alcohol, and more soluble in water.
Mr. Purkis found, by the results of different accurate experiments, that 1 pound of catechu was equivalent to 7 or 8 of oak bark.
Catechu has been considerably employed by calico-printers of late years, as it affords a fine permanent substantive brown, of the shade called carmelite by the French.
A solution of one part of catechu in ten parts of water, which is reddish brown, exhibits the following results with-- Acids A brightened shade.
The astringent taste of old brandy is imitated by the introduction of a little catechu into the British spirits.
The brown colour called carmelite by the French is produced by one pound ofcatechu to four ounces of verdigris, with five ounces of muriate of ammonia.
If the cider is preferred pale, the catechu must be omitted, and instead of isinglass, a quart of skimmed milk is to be used as 'finings.
Originally they were composed chiefly of catechu and sugar, flavoured and perfumed with the stronger aromatics; but at the present day the catechu, from which they derive their name, is not unfrequently omitted.
Catechu is extensively employed in medicine, both internally and externally, as an astringent.
To the foregoing, from two to eight grains of powdered catechu may be added should it seem to be required, but it is not generally needed.
The drug known as catechu is principally prepared from this tree, the wood of which is boiled down, and the decoction subsequently evaporated so as to form an extract much used as an astringent.
A kind of catechu is obtained by boiling down the seeds to the consistence of an extract, but the chief supply of this drug is Acacia catechu.
The result is that the blue on the silk is decomposed, and the goods by absorbing the tannin in the catechu increase in weight from 35 to 40 per cent.
A catechu bath is now prepared, in which the silk is entered and worked for an hour, and then allowed to steep over night.
All the operations thus far have had for their object the weighting of the silk, although the blueing and the catechu baths have some influence on the finished result.
The water of the first boiling becomes red and thick, and when this is inspissated after the removal of the nuts it forms a catechu of high astringency and dark colour called in Bombay "Kossa.
The nuts are again boiled, and the inspissated juice of the second decoction yields a weaker catechu of a brown or reddish colour.
Bombay Catechuis considered the best for dyeing purposes.
Enter in thecatechu bath first, work 20 minutes, and wring out: then through the chrome 10 minutes, and wring out.
When catechu only is used, a darker shade of brown is got by adding to the catechu 6% of its weight of copper sulphate.
Work the cotton for A1/4 hour with 2 pints catechu (1A lb.
In the dyeing of cotton, it is used for catechubrowns and other colours.
When catechu is the tanning matter employed, the cotton should be worked in a boiling decoction of it and allowed to steep till cold.
If a solution of pyrogallol be substituted to that of gallic acid, the tone is green, and to a green bordering to black when a solution of catechu is used, the catechuexerting at the same time a tanning action on the gelatine.
It is by the action of tannin (gallotannic acid) on the ferric oxides thus formed that the black is produced, and by that of catechu-tannic acid contained in the extract of catechu that one obtains a dark green, almost black color.
There is some reason for supposing that they are an occupational offshoot of the Kols and Cheros, who have become a distinct group through taking to the manufacture of edible catechu from the wood of the khair tree.
The Kunderas make toys from the dudhi (Holarrhena antidysenterica) and huqqa stems from the wood of the khair or catechu tree.
The Subah, being a merchant of Banaras, keeps the Catechu at his own disposal, and, besides the duties, has probably much profit on this article as a merchant.
Instead of lac the Muhammadans use mehndi or henna, the henna-leaves being pounded withcatechu and the mixture rubbed on to the feet and hands.
Walnut or poor-coloured rosewood can be improved by boiling half an ounce of walnut-shell extract and the same quantity of catechuin a quart of soft-water, and applying with a sponge.
Catechu is another excellent cotton dye used for various shades of brown, grey and black.
Then there is the assertion of practical dyers, that the use of copper sulphate in dyeing catechubrown on cotton assists materially in rendering this color fast to light.
It is then allowed to cool, when the Catechu subsides.
This Catechu has more of a granular, uniform appearance than that of Bengal.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "catechu" in a variety of sentences. We hope that you will now be able to make sentences using this word.
