石蕊试纸 shí ruǐ shì zhǐ

DEFINITIONS

  1. litmus paper (chemistry)

CHARACTERS

石 shí
HSK 5
stone, rock, mineral; rad. 112
蕊 ruǐ unopened flowers, flower buds
试 shì
HSK 2
test, try, experiment
纸 zhǐ
HSK 2
paper