What will happen when a dry blue litmus paper dipped in dry HCl?

What happens when blue litmus paper is dipped in a cold drink?

What happens when a blue litmus paper is treated with an acid?

Note the change in colour when a blue litmus paper is dipped in an aqueous solution of sodium hydroxide.

What happens when blue litmus is dipped into a solution of hypochlorous acid ?

Can dry HCl turn blue litmus red?

A student prepared hydrogen chloride gas by treating sodium chloride with concentrated sulphuric acid in a test tube. He held a strip of dry blue litmus paper in HCl gas coming out the test tube. The student observed that ton coming in contact with HCl gas, the colour of blue litmus paper: