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  • Lac Dye Cas 60687 93 6 Foreverest - China

    price: contact company for price

    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:


    • Phone: 865925105533

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

    • Email: Email


    Published date: August 30, 2013 -

    • 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.

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