Colloidal gold turns to red due to the red blood cells of the
gold particles.
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Gold salts or colloidal gold are used in pharmacy.
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Colloidal gold is not the type of gold used in jewelery. It is
mainly used in the medical field. It is often used in drugs, or
used as a means to detect tumors, and enhance radiotherapy.
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Nothing; gold is not soluble in water. The colloidal gold is a
more complicate problem.