Acids will turn (blue) litmus into red:
Remember:
with litmus
aciD > reD
and
Base > Blue
Blue litmus paper turns red when grape juice is added, indicating that the solution is acidic.
Red litmus paper remains red when a neutral solution is added. This is because neutral solutions do not affect the color of red litmus paper.
Blue litmus is turned red by an acidic solution
Blue litmus become red in acidic solutions.
When a base is added to red litmus paper, the indicator turns blue. This is because red litmus paper is used to indicate acidic conditions, so a base would cause the paper to change color to blue.
blue litmus paper turns to red when its in contact with acid
Acid turns blue litmus red and maintains red litmus at the same color.
Acids turns Blue litmus to Red. Bases turns Red litmus to Blue.
It will generally turn the litmus paper red.
If it is blue litmus paper ,then it turns red. But if its red litmus paper, it doesn't change color.
I think it is supposed to be PURPLE. Because of the following:It turns red when placed in acidic solutionIt turns blue when placed in alkaline solutionAnd purple when placed in neutral.
Litmus paper is basically used to test nature of solution i.e acid or alkaline. For acid blue litmus turns to red. But for alkaline red litmus turns to blue color.