Lac Dye Cas 60687 93 6 Foreverest - China

Lac dye is a yellowish red powder.

Dissolved in water it

turns bluish, dark red.

Lac dye is soluble in ethyl alcohol

and methyl alcohol, also in acetone and acetic acid.

Lac dye

is partially soluble in water and ether.

Lac dye is very

lightfast and resistant to temperature, it melts at 180° C

and decomposes at approx.

230° C.

Lac dye may be used for dying of textiles, such as silk,

cotton, wool.

It may also be used for oil painting, in

shellac varnishes and possibly in watercolours.

Lac dye is obtained from the females and eggs of the insects

known as Coccus lacca, which infest various trees,

especially fig trees, indigenous to Asia and China.

They,

and kermes and cochineal insects, are of a type commonly

called "shield-louse", as they are small and round with a

shield on the back.

Female lac insects have vestigial wings

and legs and spend their whole life gathered in large

clusters on host plants.

When lac dye is harvested, its

animal origin is virtually unrecognisable, because it is a

solid substance made up of bodies of female insects which

are dead, each with some 200 to 500 unhatched eggs, all

surrounded by a brown-red, hardened exudation.

Individual

insects are not visible, and the whole substance looks like

some form of growth on the host plant.

It is collected by

breaking off lac-bearing branches before the larvae hatch.

Some lac is left, and at swarming time the larvae of minute

size can be seen for a few days moving about to find a place

on the tree to settle and feed.

In ancient times Asiatics, who were able to observe the life

cycle, knew that lac was a substance of animal origin, so

various names meaning "little worm" were developed for lacca

and similar insects.

To Europeans, however, lac appeared to

be part of the sticks on which it was imported, thus the

name coccus (berry or acorn) was attached to lac and later

to the live insects, a misnomer for which the ancient Greeks

and Romans are held responsible.

Discussion on the confused nomenclature connected with a

number of red pigments has been undertaken by other writers.

The origin of the links between Latin coccus and granum and

English grain (all of which are associated with the idea

that lac was a seed or berry), and the links between kermes

and vermiculum (both meaning little worm) are to be found

during the medieval period and they are ably discussed by

Thompson.

When continuing the discussion with special

reference to seventeenth-century England, it is possible to

ignore the name grain, which, apart from its specialised use

in textile dyeing, was obsolete.

Nevertheless, the

seventeenth century presents an additional problem in that

the words cinnabar and sinopiawere wrongly associated with

the name sinoper lake, which may have been a development of

the medieval name cynople (Latin sinopia) mentioned by

Thompson.

Sinoper lake and the variation topias are to be found in

sources dating from the late sixteenth and early seventeenth

centuries.

The composition of both is uncertain; Thompson

states that medieval cynople was a composite lake, and it

seems that sinoper may have been similar, for that mentioned

in B.M. MS.

Sloane 1394 was derived from the dye in scarlet

cloth.

Company Contact:

• Posted By: Foreverest Resources Ltd.

• Phone: 865925105533

• Address: Flat 1604, No. 36, Lianbinli, Siming Dist, Xiamen,, Xiamen , China

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• Website: https://foreverest.net

• Business Description: FOREVEREST is the leading supplier of pine chemicals, such as gum rosin & derivative, gum turpentine & derivative products and other pine chemicals.
  
  Manufacturing by renewable and environmentally friendly raw materials since 1988.
  
  Foreverest Resources Ltd. is a family-owned company, which specializes in pine chemicals and provides reliable and comprehensive solutions for pre-sale & after-sale services.
  
  With 30 years of history in R&D of forest chemicals products in China, we focus on supplying the substitutes of natural products.
  
  Our products include modified resins, terpene based derivatives, flavor & fragrance ingredients, and other biobased chemicals to meet the unique demands of Detergents & Disinfectants, Flavors & Fragrances, Adhesives & Printing Inks, Pharmaceutical & Personal Care, Food & Beverages, and Agrichemical & Cleaning industry, etc.