"The available data are insufficient for the establishment of a MAK value for DAB. The

unequivocal genotoxicity  in vitro and the structural similarity between DAB and other

benzidine derivatives which are known to be carcinogens are sufficient grounds for the

suspicion that DAB could have carcinogenic potential. Further carcinogenicity studies

are necessary"

Good laboratory practice would always be to discard in this instance.  In addition gloves used for handling toxic materials should be removed in such a way that the inside surface ends up on the outside to avoid getting any of the toxin or other noxious material on your hands.  As a side effect this pretty much makes it impossible to re-use them.