The article presents the synthesis of two disazo-stilbene dyes with symmetrical structure. A non-carcinogen, non-mutagen/teratogen intermediate, 4,4'-diaminostilben-2,2'-disulfonic acid was used as central component and the 8-amino-1-naphtol-3,6-disulphonic acid and the 6-hydroxynaphthalene-2-sulphonic acid as coupling components respectively. To evaluate the characterization of the dyes, well known and applied methods were used TLC, UV-VIS and FT/IR spectroscopy. Color variations (ΔE*ab and Δh*) were determined relative to a single standard, (C.I.77891 P.W.6). The results highlight a metamerism effect and good coloring properties of the studied dyes.
Rădulescu-Grad et al. (Wed,) studied this question.
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