塩えん化かコバルト紙し

noun

cobalt chloride paper

A paper impregnated with cobalt chloride, used as a humidity indicator; it changes color from blue to pink when moist.

• 実じっ験けんで塩えん化かコバルト紙しを使つかって湿しつ度どを調しらべた。

  We checked the humidity using cobalt chloride paper in the experiment.