Description

Specification :

  • Red litmus paper is mainly used to detect alkaline solution, Nature: when the pH value is higher than 8.3, the test paper turn to blue, less than 8.3, the test paper does not change color.
  • Blue litmus paper is mainly used for the detection of acid solution, Nature: when the pH value is less than 4.5, the test paper turn to red, higher than 4.5, the test paper does not change color.
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