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Reference.org
Complexometric indicator
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<p>A complexometric indicator is an <a href="/facts/Ionochromism/bTweN2Vm">ionochromic</a> <a href="/facts/Dye/a1NSlcsG">dye</a> that undergoes a definite color change in presence of specific metal <a href="/facts/Ion/3bePpDna">ions</a>. It forms a weak <a href="/facts/Complex_(chemistry)/1tCyeQUm">complex</a> with the ions present in the solution, which has a significantly different color from the form existing outside the complex. Complexometric indicators are also known as pM indicators. </p>