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mercury i chromate is an inorganic compound with the formula Ba19Cr12O45. It is a yellow, metallic solid and the most common form of chromium. It is found in cinnabar, corderoite, and livingstonite ores. It is also found as a free element and in a number of colored compounds.
Article: Chromate Beats Like a Heart
A drop of mercury in a watch glass is covered with a solution of potassium dichromate (in acidic solutions it converts to the ion, CrO42-) and an iron nail is positioned so that it nearly touches the mercury. With no electrical connection between the iron and mercury, the dichromate oxidizes mercury to form Hg2SO4(s) on the surface of the drop, reducing its surface tension and flattening it. However, when the mercury contacts the iron nail, the transfer of electrons from the iron to the mercury reverses the flattening and the drop bounces back away from the nail.
American Elements manufactures mercury i chromate to many standard grades when applicable, including Mil Spec (military grade); ACS, Reagent and Technical Grade; Food, Agricultural and Pharmaceutical Grade; EP/BP (European Pharmacopoeia/British Pharmacopoeia) and USP with appropriate testing standards. Custom packaging is available.