noun

a natural or synthetic substance used to add a colour to or change the colour of something.

blonde hair dye

colourant,colouring agent,colouring,colour,dyestuff,pigment,tint,stain,wash

verb

add a colour to or change the colour of (something) by soaking it in a solution impregnated with a dye.

I dyed my hair blonde

colour,tint,pigment,stain,wash,colour-wash,tinge,shade