Experiment with soap

[Ajil Benny]

When soap water is applied to a paper where a thin layer of turmeric paste is coated , the paper had become red color. When washed with soap the stain of turmeric turns red because turmeric contains the tartaric acid and soap contains sodium hydroxide, a base. ... Therefore, it is the chemical reaction that led to the change in the colour of the stain from yellow to red.