Melzer's reagent

Melzer's reagent (also known as Melzer's iodine reagent, Melzer's solution or informally as Melzer's) is an iodine-based chemical reagent consisting of potassium iodide and elemental iodine (IKI) in a solution of chloral hydrate and water, used by mycologists to assist with the microscopic identification of fungi, and by phytopathologists for fungal plant pathogens. It was first described in 1924 by the Czech mycologist Václav Melzer, who used it to highlight the ornamentation on the surface of basidiospores from the mushroom genus Russula, a feature that is taxonomically important in that group and strongly enhanced by mounting in Melzer's reagent.

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