acid green
6.The indicator for calcium or magnesium in complex metric titration is discussed. Acid chromc blue K naphthol green B PVP CoH 2(NO 2) 3OH system is established as the indicator,not only for detecting calcium and magnesium,but also for single calcium and determination. At the cnd,the color changes are sharp.
8.Fourth generation product: Elastic thick film coating (organic silicon a crylic-acid copolymeric-graft polymer ), it is a green and environmental protection product, and has nontoxic, innoxious characteristics, and its incredible durability can last at least for 10 years.

