Red, it's acidic.
Litmus paper.
In a neutral solution the litmus paper is purple.
Litmus paper turn to red color.
the red litmus paper turns to blue
Red color in acidic solutions and blue color in basic solutions.
turns blue litmus paper red
hydrogen peroxide turns litmus paper into blue.
Hydrogen chloride gas is not an acid, is not in solution and does not donate protons. So, no litmus paper color change.
pH Paper. Litmus paper Hydrogen ions determine how acidic a solution is, the lower the number on the pH scale, the more acidic it is. The color for litmus paper would be a red it it was 1 and blue if it was a base.
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.