| 摘要 |
The present invention refers to trisazo dyes of the formula (I) or an alkali metal salt thereof; wherein Ar1 is an optionally substituted arylene group; Ar2 is an optionally substituted aryl group; R<1>, R<2>, R<3>, R<4>, X<1> and X<2> are defined as given in claim 1; each of D<1> and D<2>, independently, is a chromorphore group of the formula (IV) wherein the variables are defined as given in claim 1, a proces for their preparation and a process for colouring fibre material containing a group reactive with a reactive dye.
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