Inside Out Library · ExploreHydron blue G and R : patented : paste 20% and powder (1911)Cassella Color Company · New York : Cassella Color Co. · leaf 61XVIIIDyes and dyeing · Color in the textile industriesInternet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.More pictures from Hydron blue G and R : patented : paste 20% and powderMore like this
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