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Lead thiocyanate is a compound, more precisely a salt, with the formula Pb2. It is a white crystalline solid, but will turn yellow upon exposure to light. It is slightly soluble in water and can be converted to a basic salt 2·Pb2 when boiled. Salt crystals may form upon cooling. Lead thiocyanate can cause lead poisoning if ingested and can adversely react with many substances. It has use in small explosives, matches, and dyeing.
Lead thiocyanate is reasonably soluble at room temperature, thus it may be difficult to identify in a solution with low concentration of lead thiocyanate. Although it has not been confirmed by other sources than the author of this article, experiments show that even if there is no precipitation of lead thiocyanate in the solution, crystals of the salt may form.