Litmus is a water-soluble mixture of different dyes extracted from lichen. Dyeing filter paper either red or blue with this ink creates one of the oldest forms of testing alkalinity and acidity. Blue litmus paper turns red under acidic conditions. Packaged in boxes of 100 strips of paper.
Sold in a pack of 12 boxes of litmus paper.
PRODUCT WARNINGS
Our products are not toys. Use in a laboratory or educational setting only. Not for children 13 and under.