Dyestuffs Sentence Examples

By the entrance of amino or hydroxyl groups into the molecule dyestuffs are formed.

All four mono-hydroxyxanthones are known, and are prepared by heating salicylic acid with either resorcin, pyrocatechin or hydroquinone; they are yellow crystalline solids, which act as dyestuffs.

Benzo-ortho-diazines exist in two structural forms, cinnolin and phthalazine; benzo-meta-diazines are known as quinazolines; benzo-para-diazines are termed quinoxalines; the dibenzo-compounds are named phenazines, this last group including many valuable dyestuffs - indulines, safranines, &c. In addition to the types of compounds enumerated above we may also notice purin, tropine and the terpenes.

At the same time, however, all dyestuffs are coloured substances.

Derivatives of this group are important as substantive cotton dyestuffs.

The azo compounds are intensely coloured, but are not capable of being used as dyestuffs unless they contain salt-forming, acid or basic groups.

Brandy, cigars and dyestuffs are among the manufactures of the place.

The trioxyanthraquinones - purpurin, anthrapurpurin, anthragallol and flavopurpurin - are also very valuable dyestuffs.

It combines readily with the meta-aminophenols to form rhodamines, which are valuable dyestuffs.

Among such dyestuffs are chrysamine or flavophenine, obtained from salicylic acid and diazotized benzidine, and congo red obtained from sodium naphthionate and diazotized benzidine.

The industries of the place include the manufacture of porcelain, chocolate and dyestuffs, wool-spinning and bell-founding.

The great commercial value of aniline is due to the readiness with which it yields, directly or indirectly, valuable dyestuffs.

Perkin was the first of a series of dyestuffs which are now to be numbered by hundreds.

In addition to dyestuffs, it is a starting-product for the manufacture of many drugs, such as antipyrine, antifebrin, &c. Aniline is manufactured by reducing nitrobenzene with iron and hydrochloric acid and steam-distilling the product.

Coal tar dyestuffs Between 1820 and 1850 a great deal of research went on into the chemistry of coal tar dyestuffs Between 1820 and 1850 a great deal of research went on into the chemistry of coal tar.

Largely concerned with dyeing and finishing of 300 km of fabric per week, using reactive dyestuffs and discharging direct to the river.

Many of the fibers are hand-dyed using plants grown locally and natural dyestuffs from around the world.

Widely used for food coloring, medicinal, culinary, herbal dyestuffs and cosmetic uses.

Two dye ranges using disperse, vat and reactive dyestuffs process a further 150 to 200km of fabric per week.

They also worked on processes to produce other artificial dyestuffs but the board of the company was not keen to diversify at that stage.

Coal tar dyestuffs Between 1820 and 1850 a great deal of research went on into the chemistry of coal tar.

The azo compounds are intensely coloured, but are not capable of being used as dyestuffs unless they contain salt-forming, acid or basic groups (see Dyeing).