Relating to compounds containing iron, cyanide, and hydrogen, particularly ferrocyanic acid and its derivatives.
From 'ferro-' (iron) + 'cyan-' (cyanide) + 'hydric' (from Greek 'hydor' meaning water). This technical term arose in 19th-century chemistry as scientists distinguished various acids and compounds in the iron-cyanide family.
Ferrocyanic acid is intensely yellow and was used in old blueprint paper—expose it to light and the iron-cyanide compound turns blue-green, creating the ghostly blueprints architects used for a century!
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