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Anhydrous citric acid, chemical formula C6H8O7, is a colorless crystalline solid. It is a white crystalline powder made under mild conditions (usually mild heat and pressure), soluble in water, and acidic.

Optical brighteners (OBAs), also known as fluorescent whitening agents (FWAs), are chemical compounds used to enhance the appearance of textiles, paper, detergents, and other materials.

In the food industry, sodium pyrophosphate is an important food additive, mainly used as a moisture retainer, leavening agent, acidity regulator and stabilizer. It can effectively improve the water retention and taste of food, making the food softer and more delicious.

1. This Citric Acid Anhydrous is a white translucent crystal or powder. It is odorless and tastes sour. The citric acid crystallized from the cold solution contains 1 molecule of water and becomes anhydrous in dry air or heated to 40-50℃.