What chemicals are in hair dye?

Some of the most common and dangerous ingredients used in hair dyes are;

ammonia,

peroxide,

p-phenylenediamine,

diaminobenzene,

toluene-2,5-diamine,

resorcinol etc.

Explanation:

giovanni battista pergolesi, italian baroque composer who wrote one of the most famous settings of the stabat mater. don lorenzo perosi, catholic priest and director of the sistine choir under five popes.