When dealing with it you should be careful that you get nothing on the finger and if it does, immediately washes his hands thoroughly, for transfer with your fingers in the eyes or on mucous membranes it burns like hell and persistent. Even on naked (non-mucus) skin burns, the powder. Also you should make sure not to inhale the dust, by a draft or rising heat when spreading into the pot, since the nasal mucosa pretty swell eg otherwise. Greatest caution I recommend during transfer from the sachet in spreaders, ie distance from the face and then very thorough hand washing.