le. If
the colour doesn&#39;t exist within the table then nil is returned. It
should be noted that the index of a colour will be one more than its order
of entry to account for the implicit default colour entry.</p>

<h4 id="label-Parameters">Parameters</h4>
<dl class="rdoc-list note-list"><dt>colour
<dd>
<p>The colour to retrieve the index of.</p>
</dd></dl>


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