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The researchers began by mixing two polymers with potassium bicarbonate, an acid-neutralizing compound, and silver nitrate, which forms antimicrobial nanoparticles that link the polymers together to form a gel.

But the director kept a copy, shot on highly unstable silver nitrate film, in his freezer.

My mother treated them with silver nitrate, which hurt like heck.

Fires took others—silver nitrate, the compound in early film stock which makes the images shimmer, is so flammable that a tightly wound roll of such film can burn even submerged in water.

It includes a little detective story, told by a fellow chemist, of how intermittent batches of silver nitrate papers supplied for X-ray imagery were spoilt.