Whatman^® indicator papers

Blue and red litmus paper and phenophthalein strips are mixed-indicator tests designed for fast, accurate, and reliable pH solution testing.

Universal indicators

Cytiva′s acid-alkali litmus paper is impregnated with a mixture of pH indicators. They assume a color specific to sample pH upon contact with a sample. The convenience of using indicator papers for the rapid determination of pH values has a variety of applications in laboratories and industry.

• Red litmus paper turns blue in alkaline solutions
• Blue litmus paper turns red in acidic solutions
• Phenophthalein strips are colorless in acidic solutions and pink in basic solutions

Blue and red litmus papers

These easy-to-use test papers facilitate a general test for acid or alkaline reactions. Change in color occurs around pH 5 to 8. Blue and red litmus paper reels are particularly recommended for educational use.

Phenophthalein reels

Phenophthalein white paper changes to pink at pH 8.3 and becomes red at pH 10. These pH indicator strips are useful for the determination of the neutralization point in weak acid/strong alkali reactions.

Field of Use : For internal research use only. Products are not intended for diagnostic use or resale.

Whatman is a registered trademark of Cytiva