Apparently its the para-phenylenediamine or PPD chemical found in powder hair dye that is giving certain people bad reactions.
Do a patch test.
And from another source:
Bigen Hair dye has a 12.5% PPD content, and may cause severe allergic reactions. 6% is the maximum allowed by FDA law. According to the article above, Dose–time relationships for elicitation of contact allergy to para - phenylenediamine., .01% is sufficient to cause an allergic reaction.