ronmental attacking agents, and especially against light and process for protecting the hair using the compound1993-08-31Dubief et al.5227153Use of 4-(2-oxo-3-bornylidenemethyl)benzenesulfphonic acid or its salts for the protection of hair against environmental attacking agents, and in particular against light, and process for the protection of hair using this compound1993-07-13Grollier et al.5196