None of them will hurt your hands or skin unless you are allergic to them. This is how they are stored. lol and I used to scoop tit into bags when I worked there with my bare hands to take home. lol. I think its safe to say that they can't be too harmful to inhale either (used to be a wind trap this bay)
Incidentally this is how your dry/play sand is stored!!!
As Andy indicated, touching KNO3 or KH2PO4 is like touching table salt. We need to stop thinking of these dry powders as toxic chemicals and instead see them as food. When we change this mind set and eliminate our fear we will have an easier time growing plants.
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