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Onions as Toxic Cleanup Sponges

(Discover Magazine) Onions and garlic can turn around a bland dish, but Indian biotechnologists have found another use for these roots: filtering heavy metals from toxic brews.
Scientists looking for new cleaning compounds mixed onion and garlic leftovers from canning factories with various industrial wastes.
The two Allium roots absorbed about 70 percent of toxins — including arsenic, cadmium, mercury and lead — and they could be reused to clean again. 
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