I think the "myth" (relatively speaking) of the hazards of photo chemistry comes from the earliest days of the Daguerrotypists working with mercury vapors. THAT will kill you, over time. Even then, though, it takes 30-40 years of sniffing mercury vapors on a daily basis to work its harm. Most modern stuff is relatively harmless by comparison. As noted previously, keep your hands out of the soup and don't drink the leftovers and you'll be fine. The toxins in Pyro will give you short-term symptoms (tingling sensations, metallic taste in your mouth) long before permanent harm sets in. Yes, the oxalates are poisons, but they're naturally occuring, (Potassium Oxalate comes from Rhubarb - but you probably get more of it from eating Rhubarb pie than you do from handling pt/pd prints). And the good news is that at least with the PotOx, it doesn't stay in your body like the metals do.