How about bw developers? Are they still skin sensitizers? If so, much less?
Both paraphenylenediamine and orthophenylenediamine are powerful sensitizers and can cause severe blistering in sensitive individuals besides cross sensitizing people to metol and the color developing agents. This is why I try to discourage people from using some of the older fine grain developers that contain these chamicals or their salts. These developers really have no place considering the fine grain of today's emulsions.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.