石蕊試紙 [－－试纸]

Jyutping sek6 jeoi5 si3 zi2
Pinyin shí ruǐ shì zhǐ

Definitions (CC-CEDICT)
  1. litmus paper (chemistry)
Definitions (粵典–words.hk)
  1. 名詞
    測量​酸鹼​度​嘅​試​紙​，​遇酸​變紅色​，​遇鹼​變藍色
    litmus paper
Definitions (Wiktionary)
  1. noun
    litmus paper