ferricyanide

To reduce the heat carried by these moving ions, Zhou and his colleagues spiked their ferricyanide with a positively charged organic compound called guanidinium.

Welham used a photogram printing process called wet cyanotype, where ammonium citrate and potassium ferricyanide are mixed to create a photosensitive solution which is then painted on to watercolour paper and left to dry.

When I was growing up my chemistry set had a lot of potentially harmful chemicals like copper sulfate and potassium ferricyanide.

Ferrocyanide–ferricyanide has been used as a reversible redox couple, but it could potentially produce toxic hydrogen-cyanide gas at the electrodes.

Cyanotype is a photographic medium that uses ferric ammonium citrate, potassium ferricyanide, and simple sunlight to make an image.