Tin of Congo-Red litmus paper
Neutral litmus paper
1930-1940
Red litmus paper
1930-1940
Pink litmus paper
1860-1900
Small rectangular book of pink litmus paper
1850-1900
Two booklets of litmus paper
Yellow litmus paper
1860-1900
Pad of litmus paper and 3 small metal scoops wrapped in paper
1930-1960