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But before putting the electrodes in place, they dunked one in brine, waiting for chloride ions to infiltrate the pore spaces in the electrode and react to form solid silver chloride.

They began by screen printing carbon and silver chloride electrodes onto a polyester base.

It is not just footwear that you can treat to make it last longer: brands such as Polygiene use silver chloride technology, which is antimicrobial, to put a finish on fabrics.

Then they work side by side, each capturing the landscape in large-format, black-and-white photographs — specifically, gelatin silver chloride contact prints, something of a lost art.

What some people don’t know about film is that it’s coated with a thin layer of silver chloride, silver bromide or silver iodide.