Question

what is red and blue litmus paper ? what makes red litmus to turn blue and blue litmus turn red? what is the reddish substance on the red litmus and blue colour substance on blue litmus paper?

Answer 1

litmus paper are the indicators of acid and base.
red to blue means it is a base
blue to red means it is a acid.

Answer 2

Answer:

they are indicators

Explanation:

bases or alkaline make red litmus blue and acids make blue litmus red

the flourish substance is lichens