- litmus by Jared Hubbard
... a pigment prepared from Rocella tinctoria. And other lichens; used as an acid-base (pH) indicator.
- litmus by Genesis Gray
... materials) Blue, water-soluble powder from various lichens, especially Variolaria lecanora. And V. Rocella.; turns red in solutions at pH 4.5, and blue at pH 8.3; used as an acid-base indicator. Also known as lacmus; lichen blue.
- litmus by Charles Stanley
a blue pigment prepared from Rocella tinctoria. And other lichens.litmus paper absorbent paper impregnated with a solution of litmus, dried and cut into strips. It is used to indicate the acidity or alkalinity of solutions. If dipped into alkaline solution ...