Presence of Electrolytes:

The presence of small amounts of colorless electrolytes which do not react chemically with the colored components does not affect the light absorption as a rule. However, large amounts of electrolytes may affect the absorption spectrum qualitatively as well as quantitatively. This is because of the physical interaction among the ions of the electrolyte and the colored ions or molecules. This interaction results in a deformation of the later, thus causing a modification in its light absorption property.