Complexometric indicators are water-soluble organic molecules. Some examples are:
* Calcein with EDTA for calcium
* Patton-Reeder Indicator with EDTA for calcium with magnesium
* Curcumin for boron, that forms Rosocyanine, although the red color change of curcumin also occurs for pH > 8.4
* Eriochrome Black T for aluminium, cadmium, zinc, calcium and magnesium
* Fast Sulphon Black with EDTA for copper
* Hematoxylin for copper
* Murexide for calcium and rare earths, but also for copper, nickel, cobalt, and thorium
* Xylenol orange for gallium, indium and scandium