Tuesdayâs debate between the Democratic presidential candidates, including Hillary Clinton and Bernie Sanders, will be streamed online for free. CNN, which is hosting the debate, will have it available on CNN.com and on the networkâs mobile apps. Coverage begins at 8:30 p.m.
Paraphenylenediamine (PPD) is a chemical substance that is widely used as a permanent hair dye. It may also been found in textile or fur dyes, dark coloured cosmetics, temporary tattoos, photographic developer and lithography plates, photocopying and printing inks, black rubber, oils, greases and gasoline.
What PPD's do is allow the colour in hair dye-particularly dark colours-to stick to the hair shaft. It's what makes permanent hair dyes... Permanent! Bleach undoes the work that PPD's do but that doesn't mean that if you have a reaction to PPD's you should use a bleach.