metachrome, n. and a.
(ˈmɛtəkrəʊm)
[f. meta- + Gr. χρῶµα colour.]
A. n. A body that changes colour.
| 1876 Chem. News 11 Feb. 60/2 The author..passed on to the classification of metachromes, which he [Ackroyd] arranges in two groups. |
B. adj. Dye Chem. Designating mordant dyes and their mordants that may be applied simultaneously in the same bath, and the method of dyeing by this process.
| 1901 Jrnl. Soc. Dyers & Colourists XVII. 66/1 Metachrome Brown B Paste: This colour is the first of a new series of (metachrome) dyes which have the property of dyeing in the single bath with metallic salts. Ibid., With less than 3 per cent. dyestuff, 3 per cent. metachrome mordant must be used, but with larger amounts of dyestuff an equal amount. 1927 Horsfall & Lawrie Dyeing Textile Fibres ix. 263 The meta-chrome process as originally introduced..was confined to a comparatively small number of dyestuffs derived from picramic acid. 1963 A. J. Hall Textile Sci. iv. 184 The third (metachrome) method enables both dye and bichromate to be applied at the same time and it depends on the fact that no appreciable combination occurs between the bichromate and the wool or the dye under alkaline conditions, but this holds only for a limited number of dyes. 1971 R. L. M. Allen Colour Chem. iv. 45 In 1900 the Berlin Aniline Company devised the metachrome method whereby selected dyes can be applied simultaneously with a chroming agent. |