Blue Litmus Paper Strips in Cardboard Box

This blue litmus paper is supplied in a cardboard box containing 5 books, each with 20 leaves measuring approximately 63.5mm x 10mm. The total box provides 100 individual test strips for acid-base testing. Blue litmus paper turns red in the presence of acidic solutions, providing a simple and immediate visual indicator of pH below 7. It is one of the most widely used qualitative pH indicators in chemistry education and basic laboratory work. The paper strips are pre-cut and ready to use. Tear a single leaf from the book, dip or touch it to the test solution, and observe the color change. Suitable for classroom demonstrations, student lab exercises, and quick qualitative pH checks.