www.google.com.auhttp://www.google.com.au/patents/US3595658?utm_source=gb-gplus-sharePatent US3595658 - NON-SILVER DIRECT POSITIVE DYE BLEACH- OUT SYSTEM USING POLYMETHINE DYES AND COLORED ACTIVATORS
NON-SILVER DIRECT POSITIVE DYE BLEACH- OUT SYSTEM USING POLYMETHINE DYES AND ...
