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toning blue
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toning blue

pigment
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Quick Summary

Toning blue is a type of Prussian blue, a deep blue pigment composed of complex iron cyanides. While Prussian blue itself has a reddish tint and is used in paints, toning blue is specifically described as dull with a strong red tone. These pigments are chemically similar, with variations in shade due to particle size and manufacturing differences. Prussian blue was first synthesized around 1704 and is produced through reactions involving iron salts and ferrocyanide, with modern methods using more economical sodium ferrocyanide. Blue light falls within the wavelength range of 450–495 nanometres in the visible spectrum.12

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3 Britannica Sources
  1. dye toning
  2. Prussian blue
  3. blue

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