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.
Related substances to PPD which may also cause an allergic reaction. 1  Azo dyes: used in semi-permanent and temporary hair dyes, ballpoint pen inks, gasoline and diesel oil, and as colouring agent in foods and medications. 2  Benzocaine and procaine: these are local anaesthetics used by doctors and dentists.