@lynneblundell Well, here’s some safety data on those materials I listed as reagents.
KBrO3 i already addressed, but here’s more specifics: “contact with combustible materials may cause fire. Incompatible with combustible material, organics, reducing agents, aluminium, finely powdered metals. Harmful if swallowed. Possible human carcinogen. Eye, skin and respiratory irritant.” Source
Malonic acid is, actually, not too bad.
KBr: (sorry for the caps):” HARMFUL IF SWALLOWED OR INHALED. AFFECTS CENTRAL NERVOUS SYSTEM, BRAIN AND EYES. MAY CAUSE IRRITATION TO SKIN, EYES, AND RESPIRATORY TRACT. ” Source
H2SO4 is a strong acid: “Causes severe irritation and burns. May be harmful if swallowed. Avoid breathing vapor or dust. Use with adequate ventilation. Avoid contact with eyes, skin, and clothes. Wash thoroughly after handling. Keep container closed. ” Source
And of course water’s okay (though you have to be careful with mixing a strong acid and water, as it can heat up a lot, enough to break glassware, and can even explode), and Ferroin is also rather mild. So, that’s half of the requisite materials that are highly dangerous. Yeah, not a good idea outside of a lab.