turmeric paper

• 1. 

  N paper impregnated with turmeric used as a test for alkalis, which turn it brown, and for boric acid, which turns it reddish brown 姜黄试纸; 灌注了姜黄，用作碱的试验中使其变棕，做硼酸试验时使其变得棕红 [chem]