while eating food, you spill some curry on your shirt. You immediately scrub with soap, what happens to its yellow colour on scrubbing with soap ? What happens to the stain when the shirt is washed with plenty of water ?

Explanation

On scrubbing with soap, its yellow colour changes to reddish brown. It happens because soap is basic in nature and the colour of turmeric changes from yellow to reddish brown. When the shirt is washed with plenty of water,the stain turns yellow again.