Melzer's Reagent
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Melzer's Reagent (also known as Melzer's solution) is a chemical reagent used by mycologists to assist with identifying specimens.
It consists of a combination of iodine with methyl chloride and potassium iodide.
If a fungal tissue contains starch, it will turn navy blue when tested with an Melzer's Reagent. This is called an amyloid reaction. The other major reaction to Melzer's solution is a dextrinoid reaction, where the tissue changes to reddish-brown.
The substance is toxic to humans.
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