Two other methods are reported, the chlorostannate process and the ferrocyanide process.
From the en.wikipedia.org
It has the remnants of potassium ferrocyanide used in the developer while the print was being processed.
From the lens.blogs.nytimes.com
Areas of the compound exposed to strong light are converted to insoluble blue ferric ferrocyanide, or Prussian blue.
From the en.wikipedia.org
Sodium ferrocyanide, also known as yellow prussiate of soda, is sometimes added to salt as an anticaking agent.
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Potassium ferrocyanide is used to achieve a blue color on cast bronze sculptures during the final finishing stage of the sculpture.
From the en.wikipedia.org
Metal replacement toners replace the metallic silver, through a series of chemical reactions, with a ferrocyanide salt of a transition metal.
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If you want to learn the secrets of holding detail in a deep shadow or the proper incantation to use with ferrocyanide, Sid Kaplan is definitely your man.
From the lens.blogs.nytimes.com
Upon further investigation, however, authorities learned that the chemical appeared to be potassium ferrocyanide, which is not lethal when diluted in water.
From the time.com
Rome's chief prosecutor Salvatore Vecchione said the substance appeared to be potassium ferrocyanide, a chemical commonly used in gardening and textile dyeing.
From the time.com
More examples
Salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate
Ferrocyanide is the name of the anion 4u2212. Salts of this coordination complex give yellow solutions. It is usually available as the salt potassium ferrocyanide, which has the formula K4Fe(CN)6. 4u2212 is a diamagnetic species, featuring low-spin iron(II) center in an octahedral ligand environment...
Any of various salts containing the tetravalent anion Fe(CN)6^4-; used in making blue pigments; a complex ion in which a central ferrous iron atom is surrounded by six cyanide ions