CHAPTER XI.

_MATERIALS USED._

=Alkanet-root= (botanical name, _Anchusa tinctoria_).--This plant is a

native of the Levant, but it is much cultivated in the south of France

and in Germany. The root is the only part used by French polishers to

obtain a rich quiet red; the colouring is chiefly contained in the bark

or outer covering, and is easily obtained by soaking the root in spirits

or linseed-oil. The plant itself is a small herbaceous perennial, and

grows to about a foot in height, with lance-shaped leaves and purple

flowers, and with a long woody root with a deep red bark.

=Madder-root= (_Rubia tinctoria_).--This plant is indigenous to the

Levant; but it is much cultivated in Southern Europe, and also in India.

Its uses are for dyeing and staining; it can be procured in a powdered

state, and imparts its red colour when soaked in water or spirits. This

is a creeping plant with a slender stem; almost quadrangular, the

leaves grow four in a bunch; flowers small, fruit yellow, berry double,

one being abortive. The roots are dug up when the plant has attained the

age of two or three years; they are of a long cylindrical shape, about

the thickness of a quill, and of a red-brownish colour, and when

powdered are a bright Turkish-red. Extracts of madder are mostly

obtained by treating the root with boiling water, collecting the

precipitates which separate on cooling, mixing them with gum or starch,

and adding acetate of alumina or iron. This is in fact a mixture of

colouring matter and a mordant.

=Red-sanders= (_Pterocarpus santalinus_).--The tree from which this wood

is obtained is a lofty one, and is to be found in many parts of India,

especially about Madras. It yields a dye of a bright garnet-red colour,

and is used by French polishers for dyeing polishes, varnishes,

revivers, etc.

=Logwood= (_Hæmatoxylon campeachianum_).--This is a moderate-sized tree

with a very contorted trunk and branches, which are beset with sharp

thorns, and blooms with a yellow flower. It is a native of Central

America and the West Indies. This valuable dye-wood is imported in logs;

the heart-wood is the most valuable, which is cut up into chips or

ground to powder for the use of dyers by large powerful mills

constructed especially for the purpose. Logwood, when boiled in water,

easily imparts its red colour. If a few drops of acetic acid (vinegar)

is added, a bright red is produced; and when a little alum is added for

a mordant, it forms red ink. If an alkali, such as soda or potash, is

used instead of an acid, the colour changes to a dark blue or purple,

and with a little management every shade of these colours can be

obtained. Logwood put into polish or varnish also imparts its red

colour.

=Fustic= (_Maclura tinctoria_).--This tree is a native of the West

Indies, and imparts a yellow dye. Great quantities are used for dyeing

linens, etc. The fustic is a large and handsome evergreen, and is

imported in long sticks.

=Turmeric= (_Curcuma longa_).--Turmeric is a stemless plant, with

palmated tuberous roots and smooth lance-shaped leaves. It is imported

from the East Indies and China. The root is the part which affords the

yellow powder for dyeing. It is also a condiment, and is largely used in

Indian curry-powder. Paper stained with turmeric is used by chemists as

a test for alkalies, and it is also used in making Dutch, pink, and

gold-coloured varnishes.

=Indigo= (_Indigofera tinctoria_).--Indigo is a shrub which grows from

two to three feet in height, and is cut down just as it begins to

flower. It is cultivated in almost all the countries situated in the

tropics. The dye substance is prepared from the stems and leaves, and is

largely used in calico-printing.

=Persian Berries= (_Rhamnus infectorius_).--These berries are the

produce of a shrub of a species of buckthorn common in Persia, whence

they derive their name; but large quantities are also imported into

England from Turkey and the south of France. The berries are gathered in

an unripe state, and furnish a yellow dye.

=Nut-galls.=--These are found upon the young twigs of the Turkish dwarf

oak (_Quercus infectoria_), and are produced by the puncture of an

insect called Cynips. The supply is principally from Turkey and Aleppo.

Nut-galls contain a large quantity of tannin and gallic acid, and are

extensively used in dyeing.

=Catechu.=--This is obtained from the East Indies, and is the extract of

the _Acacia catechu_, a thorny tree. The wood is cut up into chips

similar to logwood, and after boiling and evaporation the liquor

assumes the consistency of tar; but when cold it hardens, and is formed

into small squares. It is extensively used by tanners in place of oak

bark.

=Thus.=--Thus is the resin which exudes from the spruce-fir, and is used

by some polishers in the making of polishes and varnishes.

=Sandarach= is the produce of the _Thuya articulata_ of Barbary. It

occurs in small pale yellow scales, slightly acid, and is soluble in

alcohol; it is used in both polishes and varnishes.

=Mastic= exudes from the mastic-tree (_Pistacia lentiscus_), and is

principally obtained from Chios, in the Grecian Archipelago. It runs

freely when an incision is made in the body of the tree, but not

otherwise. It occurs in the form of nearly colourless and transparent

tears of a faint smell, and is soluble in alcohol as well as oil of

turpentine, forming a rapidly-drying but alterable varnish, which

becomes brittle and dark-coloured by age.

=Benzoin.=--This is the produce of the American tree _Laurus benzoin_,

and also of the _Styrax benzoin_ of Sumatra, which is called "gum

benjamin"; it is used in polishes and varnishes, and as a cosmetic, and

is also burnt as incense in Catholic churches.

=Copal= is one of the most valuable of gums, and is furnished by many

countries in the districts of Africa explored by Mr. H. M. Stanley, the

discoverer of Livingstone. Copal is found in a fossil state in very

large quantities. The natives collect the gum by searching in the sandy

soil, mostly in the hilly districts, the country being almost barren,

with no large tree except the Adansonia, and occasionally a few thorny

bushes.

The gum is dug out of the earth by the copal gatherers at various

depths, from two or three to ten or more feet, in a manner resembling

gold-digging; and great excitement appears when a good amount is

discovered. The gum is found in various shapes and sizes, resembling a

hen's egg, a flat cake, a child's head, etc. There are three kinds,

yellow, red, and whitish; and the first furnishes the best varnish and

fetches the highest price from the dealers. Many of the natives assert

that the copal still grows on different trees, and that it acquires its

excellent qualities as a resin by dropping off and sinking several feet

into the soil, whereby it is cleansed, and obtains, after a lapse of

many years, its hardness, inflammability, and transparency.

=Dragon's Blood= is the juice of certain tropical plants of a red

colour, especially of the tree _Pterocarpus draco_. After the juice is

extracted, it is reduced to a powder by evaporation. It is used for

darkening mahogany, colouring varnishes or polishes, etc., and for

staining marble. Chemists also use it in preparing tinctures and tooth

powders.

=Shellac=--or, more properly, _gum-lac_--is a resinous substance

obtained from the Bihar-tree, and also from the _Ficus Indica_, or

Banyan-tree. It exudes when the branches are pierced by an insect called

the _Coccus ficus_. The twigs encrusted with the resin in its natural

state is called Stick-lac. When the resin is broken off the twigs,

powdered, and rubbed with water, a good deal of the red colouring matter

is dissolved, and the granular resin left is called seed-lac; and when

melted, strained, and spread into thin plates it is called shellac, and

is prepared in various ways and known by the names of button, garnet,

liver, orange, ruby, thread, etc., and is used for many purposes in the

arts. Shellac forms the principal ingredient for polishes and spirit

varnishes. Red sealing-wax is composed of shellac, Venice turpentine,

and vermilion red; for the black sealing-wax ivory-black is used instead

of the vermilion. Shellac is soluble in alcohol, and in many acids and

alkalies. Lac-dye is the red colour from the stick-lac dissolved by

water and evaporated to dryness. The dye, however, is principally from

the shrivelled-up body of the insect of the Stick-lac.

Shellac is produced in the largest quantity and the best quality in

Bengal, Assam, and Burmah. The chief seat of manufacture is Calcutta,

where the native manufacturers are accused of adulterating it with resin

to a considerable extent. The best customers are Great Britain and the

United States, though the demand in the Italian markets appears to be on

the increase.

=Amber= is a yellow, semi-transparent, fossil resin; hard but brittle,

and easily cut with a knife; tasteless, and without smell, except when

pounded or heated, and then it emits a fragrant odour. It has

considerable lustre; becomes highly electric by friction; and will burn

with a yellow flame. It is found in nodules of various sizes in alluvial

soils, or on the seashore in many places, particularly on the shores of

the Baltic. Amber is much employed for ornamental purposes, and is also

used in the manufacture of amber-varnish. It will not dissolve in

alcohol, but yields to the concentrated action of sulphuric acid, which

will dissolve all resins except caramba wax.

=Pumice-stone.=--This well-known light and spongy volcanic substance is

extensively quarried in the small islands that lie off the coast of

Sicily. Its porosity and smooth-cutting properties render it of great

value to painters and polishers for levelling down first coatings.

Ground pumice-stone is the best for cutting down bodies of polish or

varnish that are more advanced towards completion. The best way to get a

surface to a piece of lump pumice-stone is to rub it down on a flat York

stone, or, better still, an old tile that has been well baked.

Pumice-stone should not be allowed to stand in water; it causes the

grain to contract and to harden, thereby deteriorating its cutting

properties.

=Linseed-oil.=--This valuable oil is obtained by pressure from the seed

of the flax plant (_Linum usitatissimum_). Linseed contains on an

average about 33 per cent. of oil, though the amount varies materially,

the percentage obtained fluctuating considerably, not being alike on any

two successive days. This is partly due to the varying richness of the

seed, and partly to the manner in which it is manipulated in extracting

the oil, it being a very easy matter to lose a considerable percentage

of the oil by a lack of skill in any of the processes, though they all

seem so simple.

The first thing done with the seed from which the oil is to be extracted

is to pass it through a screen, to cleanse it from foreign substances.

The seed is received in bags containing from three to four bushels, and

pockets containing one-sixth of that amount. Having been screened it is

passed through a mill, whose large iron-rollers, three in number, grind

it to a coarse meal. Thence it is carried to what are known as the

"mullers," which are two large stones, about eight feet in diameter and

eighteen inches thick, weighing six tons each, standing on their edges,

and rolling around on a stone bed. About five bushels of the meal are

placed in the mullers, and about eight quarts of hot water are added.

The meal is afterwards carried by machinery to the heaters, iron pans

holding about a bushel each. These are heated to an even temperature by

steam, and are partly filled with the meal, which for seven minutes is

submitted to the heat, being carefully stirred in order that all parts

may become evenly heated. At the end of that time the meal is placed in

bags, which in turn are placed in hydraulic presses, iron plates being

placed between the bags. Pressure is applied for about eight minutes,

until, as is supposed, all the oil is pressed out, leaving a hard cake,

known to the trade as oil-cake, or linseed-cake.

The product of these various processes is known as "raw" oil, a

considerable portion of which is sold without further labour being

expended upon it. There is, however, a demand for "boiled" oil, for

certain purposes where greater drying properties are needed. To supply

this want oil is placed in large kettles, holding from five hundred to

one thousand gallons, where it is heated to a temperature of about 500

degrees, being stirred continually. This process, when large kettles are

used, requires nearly the entire day. While the boiling process is going

on, oxide of manganese is added, which helps to give the boiled oil

better drying properties. A considerable portion of the oil is bleached,

for the use of manufacturers of white paints.

=Venice Turpentine.=--This is obtained from the larch, and is said to be

contained in peculiar sacs in the upper part of the stem, and to be

obtained by puncturing them. It is a ropy liquid, colourless or brownish

green, having a somewhat unpleasant odour and bitter taste.

=Oil of Turpentine= is the most plentiful and useful of oils. It is

obtained in America from a species of pine very plentiful in the

Carolinas, Georgia, and Alabama, known as the long-leaved pine (_pinus

Australis_), and found only where the original forest has not been

removed.

=Methylated Spirits.=--The methylated spirit of commerce usually

consists of the ordinary mixed grain, or "plain" spirit, as produced by

the large distillers in London and elsewhere, with which are blended,

by simply mixing in various proportions, one part vegetable naphtha and

three parts spirits of wine. The mixing takes place in presence of a

revenue officer, and the spirits so "methylated" are allowed to be used

duty free. The revenue authorities consider the admixture of naphtha,

having so pungent and disagreeable a smell, a sufficient security

against its sale and consumption as a beverage. No process has yet been

discovered of getting rid of this odour. It is illegal for druggists to

use it in the preparation of medicinal tinctures, unless they are for

external use.

PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES.

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=LEATHER MANUFACTURE.= A Practical Handbook of Tanning, Currying, and

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Grafting and Budding. C. BALTET 2/6

Bees for Pleasure & Profit. G. G. SAMSON _net_ 1/-

CROSBY LOCKWOOD & SON, 7, Stationers' Hall Court, E.C.

Transcriber's notes:

page

14. add period after "the above processes"

29. varnsh corrected to varnish

31. from corrected

32. closing quote added after Polish

44. polish aud spirits changed to and

93. added parens close after "finish

95. earthern corrected to earthen

97. boiled-linseed oil corrected to boiled linseed-oil

104. period after coarsely

114. campeachiaum corrected to campeachianum

130. published net added right bracket

131. net added right bracket

131. OF METALS added period

134. added right bracket ]

135. Material [added right bracket] Uses of

137. "Refining"--Power Consumption added dashes

138. added ] in 3 places

End of Project Gutenberg's French Polishing and Enamelling, by Richard Bitmead

French Polishing and Enamelling: A Practical Work of Instruction · 第 11 / 11 章