What’s the blue one on the shallot?

Best answer: It’s a chemical called copper sulfate, which may be used by vendors for preservation during transportation. Moreover, vegetables that have used copper sulfate will look greener. Copper sulfate is water-soluble, and the removal effect is very good after soaking and washing with water. If it is Bordeaux mixture residue, the effect of simple washing will be worse, which can be supplemented by gentle rubbing or scrubbing. If you are really worried, first cut off the roots contaminated with copper sulfate and then wash them with water.

It is a chemical called copper sulfate, which may be used by vendors for preservation during transportation. Moreover, vegetables that have used copper sulfate will look greener. Copper sulfate is water-soluble, and the removal effect is very good after soaking and washing with water. If it is Bordeaux mixture residue, the effect of simple washing will be worse, which can be supplemented by gentle rubbing or scrubbing. If you are really worried, first cut off the roots contaminated with copper sulfate and then wash them with water.

extended data:

Copper sulfate is an inorganic compound with chemical formula CuSO₄, and anhydrous copper sulfate is white or off-white powder.

Copper sulfate is not only a fertilizer, but also a widely used fungicide. Bordeaux mixture, copper soap solution and copper ammonium preparation are prepared from copper sulfate, quicklime, soap and ammonium bicarbonate.

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