Are there any hazards involved with the handling of toner?
Answer
No (as long as you use your head!). Here is how HP describes toner. "Toner is a nontoxic substance composed of plastic, iron, and a small amount of pigment."

Lasertoner cartridge navulling
No (as long as you use your head!). Here is how HP describes toner. "Toner is a nontoxic substance composed of plastic, iron, and a small amount of pigment."