Red litmus test paper is light roses Pink, pH color range is 4.5 (red)-8.0 (blue).

It is used to measure the property of acid and alkali of solution and turn blue when exposed to alkali.

This test paper is 100 pieces/box, 20 boxes/medium box, 500 boxes/box;

how to use test paper:
1. Test the pH value of the solution: take a small piece of test paper on watch glass or glass cover, dip the liquid to be tested with clean glass stick and drop it on the test paper. After half a second, observe the changed color, compared with standard colorimetric card, judge the properties of the solution.

2. Check the pH of the gas: first wet the test paper with distilled water, stick it to one end of glass stick, and then send it to the container mouth containing the gas to be tested to observe the change of color and judge the properties of gases.