Question

What is indicator?
What is limus?
What is turmuric?

Answer 1

Turmeric is a flowering plant of the ginger family, Zingiberaceae, the roots of which are used in cooking.

Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity.

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

Answer 2

Turmeric is the traditional yellow colored root belonging to the family of ginger.