Red litmus become blue in basic conditions.
Litmus paper.
In a neutral solution the litmus paper is purple.
The color of litmus paper in acidic solutions is red.
Litmus paper turn to red color.
Some substances do not change the color of litmus paper because they are neither acid or nor base. They are called neutral substances.
Blue litmus paper
the red litmus paper turns to blue
In a neutral solution litmus has a purple color.
fire
Red color in acidic solutions and blue color in basic solutions.
Coffee has an acidic pH - red with litmus paper.
The litmus paper will turn red.