What are metallochromic indicators? Explain the principle of action of metallochromic indicators and outline the essential requirements that must be met by an indicator to be used for the visual detection of end points in complexometric titration. 

Metallochromic indicators are a specific type of indicators used in complexometric titrations, which are titrations involving the formation of stable complexes between metal ions and ligands (complexing agents). These indicators exhibit color changes in the presence of metal ions due to the formation of colored complexes, and they play a crucial role in determining the endpoint of complexometric titrations.

Principle of Action: The principle of action of metallochromic indicators is based on the fact that when a metal ion forms a complex with _________ ______ ___ ______ __________ ____ _____ ______ __________ _________.
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