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Plants can be used to remove toxins in soil. Over time, any impurities that have accumulated will simply be  absorbed as the plant takes its nutrients from the soil. However heavy metals such as lead or mercury remain in the leaves of plants that have grown out of contaminated earth. By taking samples of leaves, and following specific histological processes, the metallic elements, if any, can be identified and the appropriate measures taken to remove them.

This process also has industry and agricultural benefits. The wine industry often suffers at the hand of contaminated fruits, infested with microscopic fungal growths. By performing an analysis on the fruit, any fungal growths can be identified and potentially removed, thus eliminating the possibility of contaminating the final product and saving the winery owners significant losses both fiscally and in raw material.