U test a substance using red litmus paper turns blue based on these results is the substance acidic or base

basic in nature

Explanation:

Litmus Test -

It is the very basic test, used to determine if the solution is acidic in nature or is basic in nature.

There are two type of litmus paper available, i. e., blue and red.

If the solution is acidic in nature,

putting a blue litmus paper turns red,

and putting a red litmus paper would not show any change.

And, hence it can be concluded that the solution is acidic in nature.

Similarly,

If the solution is basic in nature,

putting a red litmus paper turn blue,

and putting a blue litmus paper would not show any change.

And, hence it can be concluded that the solution is basic in nature.