Question

lichen is indicator of answer

Answer 1

Hey mate !!!

✋ yes , lichen is an indicator .

✋ it is purple colour dye.

✋ it belong to category of thallophyta.


,✋ it turn into red in acid .


✋ and it turn blue into base.

hope it helps ;D

thanks

Answer 2

Lichens is extracted make litmus paper which used to differentiate acid an base.
When we use solution of lichens the following observation are held :
Lichen solution is purple
The acid turn it into red.
The base turn it into blue.