Sagot :
If the litmus paper is on an acidic substance:
From blue, it will become red.
If the litmus paper is on a basic substance:
From red, it will become blue.
From blue, it will become red.
If the litmus paper is on a basic substance:
From red, it will become blue.
blue litmus turns red in an acid solution while red litmus turns blue in basic or alkaline solution