Mitsubishi Gas Chemical Company, Inc.

Tokuzo Tsuiki

Minoru Kakuda

Junichiro Sugano

A method for promoting the bleaching action of a peroxy bleaching agent which comprises using as an activating agent for the bleaching agent at least one chloro-s-triazine derivative of the formula ##SPC1## Wherein A.sub.1 and A.sub.2 are substituents which are the same or different and each represents a chlorine atom or (1) --OR.sub.1 wherein R.sub.1 is an alkyl group containing not more than 12 carbon atoms or (2) ##EQU1## wherein R.sub.2 and R.sub.3 are the same or different and each represents a hydrogen atom or an alkyl group containing not more than 12 carbon atoms, with the proviso that A.sub.1 and A.sub.2 are not chlorine atoms at the same time.

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Tokyo, Japan

Tokuzo Tsuiki