Here's why:
* Chemical reaction: Bleach works by lifting the natural pigment (melanin) from your hair. This chemical reaction generates heat, which can cause your hair to feel warm.
* Exothermic reaction: The chemical process involved in bleaching is an exothermic reaction, meaning it releases heat. This heat is what causes the warming sensation.
* Intensity of warmth: The warmth you feel will depend on factors like the strength of the bleach, the length of time it's applied, and the thickness of your hair.
Important Note: While a slight warming sensation is normal, excessive heat or burning indicates a problem. If you experience severe burning or discomfort, rinse the bleach out immediately and consult a professional hairstylist.