Actually the supplier also has to supply an MSDS sheet upon demand. And it won't have information on staining.(posted 8509 days ago)In general, do not get any developer on your hands. Do not drink any developer. And do not work with any developer in a closed room without ventilation. Virtually all developers use one of about 5 actual chemicals that will do development. Some are worse than others, but none of them are good for you.
Xtol uses a Phenidone dericative which is much less likely to cause sesnitivity than Metol that is the more classic development agent. But it is still skin absorbable, and somewhat toxic.