Naphthol

They are also called naphthol colours from the use of beta-and alpha-naphthol in their production. ❋ Franklin Beech (N/A)

Now the diazo compounds are rather unstable bodies, but they have a great affinity for other compounds, such as naphthol, phenylene diamine, phenol, and combine easily with them when brought into contact with them. ❋ Franklin Beech (N/A)

In 1869 and 1870 he was assistant to H. Wichelhaus in Berlin, with whom he worked on the nitration of b-naphthol. ❋ Unknown (1966)

Th. Zincke found that the products obtained by coupling a diazonium salt with [alpha] - naphthol, and by condensing phenyl-hydrazine with ❋ Various (N/A)

This salt has also been incorporated with milled soap in a dry state in conjunction with ammonio-mercuric chloride, [beta] - naphthol, methyl salicylate, and eucalyptol. ❋ H. A. Appleton (N/A)

In the naphthalene series, on the other hand, the ring closes up by, for instance, the condensation of [Greek: b] - naphthol with benzaldehyde or paraldehyde, and yields the following compounds: -- ❋ Georg Grasser (N/A)

The most important of the naphthol colours is undoubtedly paranitroaniline red, produced by the combination of paranitroaniline and beta-naphthol. ❋ Franklin Beech (N/A)

Leather obtained through the action of [Greek: a] - naphthol is, when freshly tanned, pure white and sufficiently soft and firm, but quickly assumes a brown colour on storing; if, however, [Greek: b] - naphthol is employed, a cream-coloured leather results, the colour of which turns only slightly more yellowish even when exposed to the direct rays of the sun. ❋ Georg Grasser (N/A)

Further, an excellent group of coloring matters, giving fast browns and greens with copper and iron mordants respectively, is formed by naphthol green, resorcinol green, gambin, and dioxin. ❋ Various (N/A)

After this they should be immersed for at least fifteen minutes in a solution of beta-naphthol (1: 2,500), which must be sufficiently deep to cover every portion of the instruments. ❋ Various (N/A)

The condensation product of b-naphthol above referred to precipitates gelatine and aniline hydrochloride and gives a brown coloration with ferric chloride. ❋ Georg Grasser (N/A)

Of the "acid blacks and violets," a few colors are of medium fastness, both on wool and silk, e.g., naphthol black, naphthylamine, black, resorcinol brown, fast brown, etc. ❋ Various (N/A)

_ -- These soaps contain, in addition to carbolic acid and its homologues, naphthalene and other hydrocarbons derived from coal, naphthol, bases, etc. ❋ H. A. Appleton (N/A)

If, on the other hand, a pasty mixture is made of formaldehyde and naphthol, and this is allowed to act upon the pelt, the latter is rapidly converted into leather, but the mixture must be administered very gradually or otherwise the insoluble methylenedinaphthol is formed outside the pelt and hinders any tanning effect. ❋ Georg Grasser (N/A)

Dr Schupphaus found that propyl and isobutyl alcohols with camphor were active solvents, and the ketones, palmitone, and stearone in alcohol solution, also alpha - and beta-naphthol, with alcohol and anthraquinone ❋ Unknown (N/A)

It is a remarkable fact that non-condensed methane derivatives of naphthol, _e. g._, b-naphthol-a-methanesulphonic acid, dissolved in water and partly neutralised, are devoid of tanning character when allowed to act upon pelt. ❋ Georg Grasser (N/A)

The antiseptic sutures and ligatures should be similarly soaked in beta-naphthol solution during the progress of the operation. ❋ Various (N/A)

During the operation the sterilized instruments should be kept in a beta-naphthol solution and returned to it when the operator is not using them. ❋ Various (N/A)

From [Greek: a] - and [Greek: b] - naphthol a number of sulphonic acids may easily be prepared; viz., mono -, di -, and trisulphonic acids. ❋ Georg Grasser (N/A)

Sponges should be kept in a beta-naphthol or a corrosive sublimate solution during the operation. ❋ Various (N/A)