What is the difference in colour of contaminated and clean water?

Contaminant is

What is the difference between pollutant and contaminant?

What is the difference between molecules of soap is added to water? Will a micelle be formed in other solvents such as ethanol also? State briefly how the formation of micelles helps to clean the clothes having oily spots.

What is the difference in the origin of colours of a soap bubble seen in sun ligth and the colours emerging from a prism ?

What are the different ways in which water gets contaminated?

What are the different types of water?