Question

What could be the reason for red colour appearing on clothes when the turmeric stain on them is washed
with soap?

Answer 1

reason is that the red colour is falling on it and reflect none of it

Answer 2

Turmeric is an acid-base indicator. When is dipped in a base, it changes its colour to red (or reddish brown).

Soap or sodium hydroxide is a base. Thus,when turmeric stain is washed with soap, it appears red.

Hope this helps you.☺