Colloidal silver is a mixture of silver particles and water that has antimicrobial properties. Formerly used on external wounds and burns to prevent infection, colloidal silver is cited by some alternative-health practitioners as a beneficial nutritional supplement and a powerful antibiotic that is relatively safe for human consumption. However, most members of the mainstream medical community warn users that it can lead to argyria, a rare but permanent condition that turns the skin what color? Discuss
Source: The Free Dictionary