The standard "TCVN 4071-2009 Candy. Determination of muriatic acid insoluble ash" specifies the determination method of muriatic acid insoluble ash in candy. This method dissolves the soluble substance in the sample by using muriatic acid and removes the organic component by high temperature incineration, and finally determines the remaining insoluble ash content. Muriatic acid insoluble ash usually reflects the mineral composition in candy, such as the content of inorganic substances such as calcium, mg, iron, etc., which is important for the quality control of candy. This standard provides candy producers with standardized detection methods to ensure that the product meets the relevant mass requirements and helps to maintain the production conformity of candy and the health and safety of consumers.