100 strips each in matching Blue color plastic vials. Individual strips are approximately 2 " long and 1/4 " wide, Pack of 100

Details:

Red litmus paper turns blue when it comes into contact with an alkaline solution. Blue litmus paper turns red or pink when it comes into contact with an acidic solution. Neutral litmus paper turns red in acid solutions and blue in base solutions. This product includes 100 strips, each measuring 2 inches long by 1/4 inch wide, packaged in plastic polypropylene vials.