noun
hair dye for gray hair
Specifically refers to dye used to cover gray or white hair, often in the context of home coloring products.
母は毎月白髪染めをしている。
My mother dyes her gray hair every month.
ドラッグストアで白髪染めを買った。
I bought hair dye for gray hair at the drugstore.
Compound of 白髪 (しらが, 'gray hair') and 染め (そめ, the noun form of 染める 'to dye').