Most kits contain a chemical reagent, sodium rhodizonate, that turns red in the presence of lead.
2.
Other more exotic carbon oxygen anions exist, such as rhodizonate ( C 6 O 6 2 & minus; ).
3.
As for reagents, that page links to the results of the study, where we find " " The two types of test kits that are currently available are based on chemical reactions of either the rhodizonate ion, which produces a pink or red color in the presence of lead, or the sulfide ion, which produces a gray, brown or black color in the presence of lead . " " talk ) 23 : 13, 26 December 2008 ( UTC)
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