New storage method inspired by antique photographic techniques SWS technology preserves data for centuries without power NASA tests confirm SWS's resilience in extreme conditions Veteran engineers ...

There are three layers of emulsion containing fine, light-sensitive grains of silver halide. The grains in the top layer are sensitive to blue light; those in the middle are sensitive to green ...

Explain why, in a test for halide ions, the sample is acidified with dilute nitric acid first. Carbonate ions also produce a white precipitate with silver nitrate solution. The acid reacts with ...