basic dyes are more effective for bacterial staining than acidic dyes because basic dyes have a positive charged chromogen. Bacterial nucleic acids and certain cell wall compo â¦ nents carry a negative charge that strongly binds to the cationic chromogen.
Zinc oxide can be used in ointments, creams, and lotions to protect against sunburn and other damage to the skin caused by ultraviolet light (see sunscreen). It is the broadest spectrum UVA and UVB reflector that is approved for use as a sunscreen by the FDA, and is completely photostable.he zinc oxide is thought to have been produced by heating zinc ore in a shaft furnace. This liberated metallic zinc as a vapor, which then ascended the flue and condensed as the oxide. This process was described by Dioscorides in the 1st century AD.
Zinc metal does not react violently with water. It hardly oxidises under normal conditions. A coating of zinc (called galvanising) is used to protect steel from rusting.Zinc has a coating of the oxide that protects it from reaction with oxygen.It becomes vulnerable to oxidation in the presence of other substances that weaken its oxide layer. Acids will quickly dissolve zinc, as will alkalies. Acids produce zinc 2+ cations, whereas alkalies produce zincate ZnO2(2-) anions.inc has a coating of the oxide that protects it from reaction with oxygen. It becomes vulnerable to oxidation in the presence of other substances that weaken its oxide layer. Acids will quickly dissolve zinc, as will alkalies. Acids produce zinc 2+ cations, whereas alkalies produce zincate ZnO2(2-) anions.