Sakai Chemical Industry Co., Ltd.

Masahiro Hoda

Yoshihiko Nakane

Akira Kotone

Kenzo Konishi

Takeshi Hori

A polyazo dye represented by the formula ##SPC1## Wherein A is an aromatic ring having or not having a substituent, B is an aromatic ring having at least one substituent selected from the group consisting of amino, substituted amino and hydroxyl, Y is hydrogen, alkali metal, --NH.sub.4 or an amine salt residue, n is 1 or 2, and each of R.sup.1 and R.sup.2 is hydroxyl or amino, R.sup.1 being amino when R.sup.2 is hydroxyl and hydroxyl when R.sup.2 is amino. The polyazo dye has outstanding utility in the dyeing of fibers having hydroxyl and/or amide groups and are not carcinogenic.

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Sakai, Japan

Masahiro Hoda