Indicators are those artificial or natural substances which changes its colour according to the acidic or basic medium. Indicator as the name suggests whether the medium is acidic or basic depending upon the specific colour change.

Indicator show one colour in acidic medium and a different colour in basic medium.

Artificial indicator is prepared from artificial chemicals or synthetically prepared from laboratory chemicals.

Example: Phenolphthalein, Methyl Orange etc.

Natural Indicators are the indicator derived from naturally occurring materials.

Examples: Litmus, China Rose Petal, Red Cabbage, Turmeric etc.