1. without stains, stains and foreign matter, odorless and tasteless. To
2. Whiteness: The whiteness of medical absorbent cotton should not be less than 80 degrees. To
3.Soluble matter in water: The residue left in the test solution for 100m workers should be less than 0.5%.
4. pH: Add phenolphthalein indicator to the 100mL test solution to not show pink, and add cresol purple indicator to not show yellow.