acid testing methods

Acid testing methods are techniques used to determine the authenticity of valuable items, like gold, by applying a specific acid that reacts differently depending on the material's composition. For example, a small scratch is made on the item and acid is applied; genuine gold will resist the acid, while some other metals will react and change color or show signs of corrosion. These tests help verify if an item is real without damaging it significantly, providing a quick and reliable way to assess value and prevent fraud.