Acid-Alkali Test Paper Books

Litmus Blue and Litmus Red
These easy-to-use test papers facilitate a general test for acid or alkaline reaction. The change occurs around pH 5-8. They are particularly recommended for educational use.

Congo Red
This test paper changes color from blue to red in the range pH 3-5 for the determination of neutralization point
in strong acid/weak alkali reactions.

Phenolphthalein
This white paper changes to pink at pH 8.3 and becomes red at pH 10. It is useful for the determination of the neutralization point in weak acid/strong alkali reactions.