PATHOLOGY

Detailed explanation-1: -Sadly, yes. While permanent hair dye won’t wash out of your hair in the same way that temporary, or semi-permanent hair dye does, it will eventually start to fade and change shade over time. The colour you go for will also influence how long your hair will stay vibrant.

Detailed explanation-2: -"Color-changing hair dyes are a semi-permanent thermochromic hair dye that layers the hair’s outer cuticle and shifts colors when exposed to a change in temperature, ‘’ says stylist Giselle Luza. In other words, the temporary dye alters from one color to another when exposed to temperature changes.

Detailed explanation-3: -When you colour your hair, chemicals in the dye change the structure of the individual strands of hair in order to let the new colour take hold. Ammonia lifts the cuticles and the peroxide breaks down the natural hair pigment. This reaction lets the colour in.