In recent years, there have been a variety of new shampoos on the market called "wash and turn black". These shampoos are generally advertised as made from pure natural plants. After usage, hair can get black quickly, safely and conveniently. On January 4th, 2009, CCTV's Weekly Quality Report revealed the secrets behind "wash and turn black" shampoo: the shampoos under several brands were actually hair dyes which added but did not indicate "para-phenylenediamine" (which could cause cancer). Some even contained "meta-phenylenediamine", a substance that could cause three kinds of diseases (cancer, mutation and deformity).