The above solution may be neutral or basic in nature as both of them will not change the colour of the blue litmus paper.
- The litmus paper gives a general indication of acidity or alkalinity.
- Under the acidic conditions, the blue paper turns red where the pH level is below 4.5.
- In contrast, the red paper does not change its colour under alkaline conditions where the pH level is above 8.3.
- Blue litmus doesn’t change its colour under alkaline conditions, while the red one doesn’t change its colour under acidic conditions.