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<p>since ferrocyanide has negligible absorption at this wavelength while ferricyanide has an <a href="page.php?w=Molar_absorptivity">extinction coefficient</a> of 1040&nbsp;M<sup>-1</sup>&nbsp;cm<sup>-1</sup>.</p>

<p><big>Applications</big></p>
<p>The dominant use of ferrocyanides is as precursors to the <a href="page.php?w=Prussian_blue">Prussian blue</a> pigments. Sodium ferrocyanide is a common <a href="page.php?w=anti-caking_agent">anti-caking agent</a>. Specialized applications involves their use as precipitating agents for production of citric acid</p><p>
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