Figure 2. Photosensitivity of silver chloride. (1) "Fresh" silver chloride partially covered by a paper clip. (2) With time the white changes to light purple. (3) The paper clip is removed. Photos: ...

The formula calls for stannous chloride — you could probably make this by dissolving tin in hydrochloric acid. There’s also thiourea — the main chemical in silver-cleaning dips like Tarn-X ...

MOST of the known reactions of molecular nitrogen take place under drastic conditions, involving high temperatures and pressures or electrical discharges. Only at room temperatures and atmospheric ...