Dyestuff

Definition and stakes

Alexander Paul,  The Practical Ostrich Feather Dyer

“ Prepare a handwarm bath with a little tartaric acid or acetic acid, to which some solution of eosine, rhodamine, azoeosine, safranine, coccine or ponceau 6 R. B. or ponceau R. R. Be particularly cautious in adding the dyestuff solutions gradually in small quantities, even by drops, to avoid over-dyeing, as by partly stripping of a too dark shade, a fine color can never be obtained, and the nature of the material demands that all unnecessary handling be avoided. After dyeing, rinse lightly, pass through starch and dry. The dyes with the ponceaus are faster than those with eosine or safranine. ”
Source: Gutenberg

John James Hummel and Edmund Knecht,  1911 Encyclopædia Britannica, Volume 8… (1911)

“ Mordant Colours.—The colouring matters of this class include some of the most important dyestuffs employed, since they furnish many colours remarkable for their fastness to light, washing and other influences. Employed by themselves, Mordant Colours are usually of little or no value as dyestuffs, because, with few exceptions, either they are not attracted by the fibre, particularly in the case of cotton, or they only yield a more or less fugitive stain. ”
Source: Wikisource

John James Hummel and Edmund Knecht,  1911 Encyclopædia Britannica, Volume 8… (1911)

“ The old idea that the vegetable dyestuffs are superior in fastness to light is gradually being given up, and, if one may judge from the past, it seems evident that in the future there will come a time when all our dyestuffs will be prepared by artificial means.
Authorities.—Macquer, Hellot and le Pileur d’Apligny, The Art of Dyeing Wool, Silk and Cotton (London, 1789) ; Bancroft, Philosophy of Permanent Colours (2 vols., London, 1813) ; Berthollet-Ure, Elements of the Art of Dyeing (2 vols., London, 1824) ; Chevreul, Recherches chimiques sur la teinture (Paris, 1835–1861)
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Source: Wikisource

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