I posted a couple months ago after INOA ruined my hair and caused a terrible allergic reaction.  After talking to a couple colorists whom I trust, I decided to do a patch test using some high quality European colors mixed with Sweet and Low (the stuff in the pink packets.)  Well, I barely reacted to Goldwell level 6, so my hairdresser has used that twice now.  Both times, I reacted a little at the hairline, but the redness went away in an hour.  She also re-highlighted my hair with bleach.  Thank goodness! My hair looks pretty good.  Dry, but good.  Here is what my hundreds of hours of research has taught me:  1.  Colors MANUFACTURED in Western Europe, especially Germany, tend to have lower amounts of PPD than colors manufactured in the US.  (Note that some colors that were previously manufactured in Europe now are made in the U.S.); 2.  Many people find that Sweet and Low buffers the PPD reaction.  My hairdresser adds four packets per batch and usually makes two separate batches per appointment; 3.  Lighter colors have less PPD than darker colors; 4.  Lots of people have problems with MEA ;  5.  There are A LOT of people on the web unhappy with INOA.  Shame on you, L'Oreal!  I will never buy anything from you again.