Stable concentrated liquid preparation of a paper dye of the disazo class

摘要

There is described a stable concentrated liquid preparation of a paper dye of the disazo class, which preparation contains 20 to 40 per cent by weight of the dye of the formula optionally in the form of an alkali salt, especially of the sodium salt, dissolved in 10 to 30 per cent by weight of water and 40 to 60 per cent by weight of a mono-, di-, tri- or tetraalkylene glycol and the use of this preparation for the dyeing and printing of paper, semi-cardboard and cardboard.