Common concentrations include , 3% , and 5% solutions, often used for etching carbon and alloy steels. Nital Etch, 3%, 500 mL - Etchant Store
You can buy (a mixture of nitric acid and alcohol) through specialized chemical suppliers and metallographic equipment retailers. Because it is a hazardous chemical, many sellers restrict shipping to commercial facilities or research laboratories . Where to Buy Nital where to buy nital