Blue Litmus Test Paper Acid Indicator 100 Strips
Blue Litmus Paper is a P.H. tester for Acid with pH between 4.3-6.8. 100 strips per vial. Blue litmus paper turns red or pink for acidic solutions (pH values lower than 7 (Neutral).  This is used in many science projects.  Each strip measures approx .25 inches x 1.75 inches.