Valblanc Chemie Pvt. Ltd. Offers Optical Whitening Agent in Bluish to Violet Tone. Valblanc Chemie Pvt. Ltd. Is an ISO 9001:2000 registered company. Valblanc Chemie Pvt. Ltd. Is the supplier of optical whitening agents. Optical Whitening Agent in Bluish to Violet Tone has an excellent nonionic OWA feature which is available with brilliant white effects for polyester. Optical Whitening Agent in Bluish to Violet Tone is suitable in the exhausts as well as the continuous dying processes. It is available in bluish to violet tone. It comes under the brand name of Luminophore ERB.