This listing is for a pre-owned unused glass vial of 100 Congo Red Test Paper strips from FIsher Scientific (No. 14-861), topped with cork. Note: I cannot guarantee the contents.
Sold by Chemistry RG Consultant Inc - Guaranty to Work Bid is for the 2 Boxes (24 vials in each box) Lead Acetate paper turns black in presence of hydrogen sulfide and other soluble sulfides Potassium Iodide/Starch paper turns blue to deep purple in the presence of low levels of chlorine, iodine, peroxide and ozone
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