Liquid hair dye composition

A method for dyeing hair, comprising:

• mixing a liquid hair dye composition comprising (A) an azo dye of the following formula (A-1) and (B) at least one selected from the group consisting of a lower monoalcohol having 2 or 3 carbon atoms, a monocyclic aromatic monoalcohol, and a diol having 2 to 6 carbon atoms, with another liquid preparation to prepare a mixture:
• and
• subsequently applying the mixture to hair for dyeing the hair,
• wherein
• a content (X) of the component (A) in the composition is from 1.5 mass % to 9.3 mass %,
• a content (Y) of the component (B) in the composition is from 9 mass % to 98.5 mass %, and
• the liquid hair dye composition satisfies the formula (1)
• Y≥10.875X−10.875 (1),
• with a proviso that the liquid hair dye composition is not a composition in which a diol content is 50 mass % or more and a water content is 2 mass % or less.