Larger | Spin | 3D. Indium foil. Indium is often used to form air-tight seals between glass components because it is soft enough to mold itself to the shape of the glass, and because unlike rubber or other organic seal materials it is really 100% gas-tight and it doesn't release volatile compounds of its own.
Melasma is a chronic skin disorder that results in symmetrical, blotchy, brownish facial pigmentation. It can lead to considerable embarrassment and distress. This form of facial pigmentation is sometimes called chloasma, but as this means green skin, the term melasma (brown skin) is preferred.
Melanoma is a type of skin cancer that can occur anywhere on the body, but MayoClinic.com reports that in women, it most often appears on the lower legs. Melanoma can appear as a large brownish spot with darker speckles. Another sign of melanoma is a mole that bleeds or changes in color, size or feel. Melanoma can affect people of all skin tones.