Answer:
Chemical Change
Explanation:
Color changes in chemical compounds are as a result of chemical reactions between the two reactant , and in this case a new reactant is been formed.
which eventually changes the color to yellow.
Indicators like Leucomalachite green do changes from green ( base) to yellow (acidic).
So for a new product to be formed which is of different color and chemical properties,the observation change is definitely a chemical change
