Two allotropes of tin occur near room temperature. The first form of tin is called gray tin and is stable at temperatures below 13.2Â°C (55.76Â°F). There are few, if any, uses for gray tin. At temperatures above 13.2Â°C, gray tin slowly turns into tin's second form, white tin. White tin is the normal form of the metal and has many uses.
Colours have been added for illustrative purposes and have no other significance. In parapsychology and spiritual practice, an aura is a supposed field of subtle, luminous radiation surrounding a person or object like the halo or aureola in religious art. The depiction of such an aura often connotes a person of particular power or holiness.
aura. a peculiar sensation preceding the appearance of more definite symptoms. An epileptic aura precedes an epileptic seizure and may involve visual disturbances, dizziness, numbness, or any of a number of sensations which the patient may find difficult to describe exactly.n epilepsy the aura serves a useful purpose in that it warns of an impending attack and gives the patient time to seek privacy and a safe place to lie down before the seizure actually begins. A migraine aura precedes about 15 per cent of migraine headaches, warning the patient that an attack is imminent.