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.
Causes and Symptoms of Melasma. Melasma shows up in the form of brown spots or patches on the cheeks, forehead, upper lip and nose. It is most common in women during their productive years and it tends to with olive skin that tans easily. My friend fits this risk factor because she always looks tan, even in winter.