Dye mixtures

Details Dye mixtures Dye mixtures

C - Chemistry, Metallurgy

09

B

C09B 67/22 (2006.01) C09B 31/08 (2006.01) C09B 33/10 (2006.01) D21H 17/09 (2006.01) D21H 21/28 (2006.01)

Patent

CA 2297369

Disclosed are dye mixtures for shading white paper which may contain fluorescent brightener. The dye mixtures comprise a violet dye according to the formula (1) or (2) indicated in claim 1 and sufficient of a red, blue or further violet dye that this dye mixture is capable of producing in the Cielab colour coordinates system a relative hue angle of 270 to 295° when the dyeing contains 0.00005 to 0.005% by weight of dye, based on the weight of the paper.

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