A chemical compound that contains both cobalt and cyanide ions bonded together, used in analytical chemistry and pigment production.
From cobalt + cyanide. Cyanide comes from Greek kyanos (blue) because early chemists noticed these compounds were intensely blue-colored.
Cobaltocyanides can be brilliant shades of blue and were once used as dyes, but chemists had to be extremely careful because free cyanide is deadly—the trick was keeping the cyanide locked tightly to the cobalt!
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