In the United States, the inflation rate is most commonly measured by the percentage rise in the Consumer Price Index, which is reported monthly by the Bureau of Labor Statistics (BLS). A CPI of 120 in the current period means that it now takes $120 to purchase a representative basket of goods that $100 once purchased.
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.
PPD is a cumulative allergy, which means it builds up in your system until your body cannot tolerate it any longer and reacts. So if you are allergic, you may not react the first or fifth or tenth time you color your hair, but eventually, you will have a reaction.f you are allergic to PPD, you may also cross-react to any of these: 1  Azo dyes and aniline dyes (often used in semi-permanent and temporary hair dyes). 2  Benzocaine and procaine (anesthetics used by doctors and dentists) Sulfonamides and sulfa drugs. 3  Para-aminobenzoic acid (PABA).