Quote Originally Posted by Photo Engineer View Post
In extensive tests by Kodak, HQ and Metol and several color developing agents (CD-3, CD-4 and CD-6) were found to be low in toxicity as they are not absorbed through the skin to any great extent.
Unfortunately hydroquinone is also readily absorbed through the skin.

I hope Gordon Hutchings is doing fine and I will take this as good enough evidence that one can use pyro as well as hydroquinone on a regular basis and stay healthy as long as you take enough care.