Since Hot Spot is now a paid advertiser on the Café and the product knowingly contains MERCURY, am I to assume the owners of the Café have done due diligence to make sure this product is safe for Café patrons to use on themselves or others?

To answer your question, It is not the responsibility of the Magic Café to research and inspect every product that is promoted, advertised or sold on this website by third parties. We expect that the people of the magic community have the good sense to carefully evaluate any purchase they make from the various individuals who may offer their wares for sale or trade.

Thank you.