Farmers can check whether an apple is ripe by cutting it in half and spraying the surface with iodine. If the iodine causes an intense blue colour, the apple isn’t ripe, Joe Schwarcz writes.

Organic solvents with densities greater than and less than that of the aqueous solution are used to extract the iodine. The aqueous solution of food color is blue. Iodine in water is yellow, and when ...

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Iodine is a mineral essential for thyroid health. Although many types of seafood are rich in iodine, other foods with iodine include eggs, dairy products, and some plant foods. Share on Pinterest ...