By Rudolf Nietzki
A bout 3 years in the past I wrote an editorial for Ladenburg s Handworterbuch der Chemie, containing in a concise shape an exhaustive account of the historical past of the natural Dyestuf Es. this text was once additionally released individually and its strong reception precipitated me to supply the current paintings, which i've got established so far as attainable upon the sooner one. the thing in query was once now not entire in itself, and within the current example convinced sections which got here less than different headings within the Handworterbuch were further. New fabric has additionally been provided in the course of the advances made within the coal-tar color and in our clinical wisdom of the structure of dyestuffs over the last 3 years. A achieve, a few topics were handled at a better size than used to be accepted through the a bit restricted house of the Handworterbuch for this reason, the subject-matter of the sooner paintings has been submitted to a radical revision, and the systematic class of dyestuffs into normal chemical teams tried within the unique e-book has been conducted in a extra whole demeanour, because of the advances made in our wisdom in their constitution.
(Typographical blunders above are because of OCR software program and do not happen within the book.)
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The 1st variation of this ebook was once welcomed with nice enthusiasm through academics and scholars. It as a result appeared opportune to put up a moment, revised, up to date and prolonged variation. regrettably, Professor Fèlix Serratosa died ahead of he may possibly entire this task.
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Additional info for Chemistry of the organic dyestuffs
Diazo-compound has to be combined with a phenol,, the former is prepared by dissolving the amine or its sulphonic acid in water, or suspending them in as finely divided a state as possible, and adding to the liquid the calculated quantities of hydrochloric acid and sodium nitrite. After diazotisation is completed the liquid is allowed to run into an alkaline solution of the phenol or its sulphonic acid, care After some time being taken that the mixture remains alkaline. the dyestuff is salted out, and is generally filtered through a The combination of diazo-compounds with amines filter-press.
Acid, Hexanitrodiphenylamine (AUEANTIA) . (N0 2 3C 6 H 2NHC 6 H 2 (N0 2 ) . ) 3 Hexauitrodiphenylamine is produced by energetic action of on diphenylamine. P. 238, and behaves like an acid, forming stable crystalline salts with the It dyes an orange shade on silk and wool, but since the alkalies. nitric acid introduction of the azo-dyes is scarcely ever used. Salicyl Yellow (NITROBROMSALICYLIC ACID) . The iiitro-compounds which are formed by treating monobromwith nitric acid have been tried experimentally in They are very fugitive to light, and this, together with salicylic acid dyeing.
Striking with the sulphonic acid of phenyl amidoazobenzene (Tropaolin OO) ; this body exhibits a colour- change from orange to violet. The azo-compounds, though long known, have attained most of their importance in the last ten years, especially the scarlet-red The first shades, which have almost entirely replaced cochineal. was triamidoazobenzene (phenylene and Griess in 1867. Caro by For ten years after this no particular progress was made in this field, and the first synthetical production of azo-compounds appears with the discovery of chrysoidine by Witt and Caro.