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<a accesskey="3" href="page.php?w=Abney_effect&amp;p=2">3.Next</a>
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<p><b>The Abney effect</b> or the <b>purity-on-hue effect</b> is the <a href="page.php?w=perception">perceived</a> <a href="page.php?w=hue">hue</a> shift that occurs when <a href="page.php?w=white">white</a> light is <a href="page.php?w=additive_color">added</a> to a <a href="page.php?w=spectral_color">monochromatic</a> light source.</p>

<p>The addition of white light will cause a desaturation of the monochromatic source, as perceived by the human observer.  However, a less intuitive effect of the perceived <a href="page.php?w=Electromagnetic_spectrum">white light</a></p><p>
<a accesskey="3" href="page.php?w=Abney_effect&amp;p=2">3.Next</a>
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