Metalic Fine Chem

Chemical Formula: Na₂S₂O₅ (Sodium Metabisulfite) or  (Potassium Metabisulfite).

Appearance: It typically appears as a white, crystalline, or powdery solid.

Odor: It has a slight sulfurous odor (similar to a struck match), which becomes much stronger when it reacts with water or acids to release sulfur dioxide gas.

Chemical Nature: It is a reducing agent and acts as a source of sulfur dioxide .

Wine and Beer Making: It is used to kill unwanted bacteria and wild yeast in the "must" (crushed grapes) before fermentation and to prevent oxidation once the beverage is bottled.

Dried Fruits: It prevents browning and preserves the color of dried apricots, raisins, and other fruits.

Seafood: It is used on shrimp and shellfish to prevent "black spot" (melanosis) caused by oxidation.

Dechlorination: It is used to neutralize residual chlorine in municipal water systems or wastewater before it is discharged into the environment to protect aquatic life.

Fixing Agent: It is used in the preparation of photographic developer solutions to prevent the oxidation of the developing agents.

Gold Mining: It is used to precipitate dissolved gold out of auric chloride solutions.

Bleaching: Used in the pulp and paper industry and in the textile industry as a bleaching agent for wool and jute.

Sanitization: Homebrewers and winemakers use a concentrated solution of metabisulfite to sanitize equipment like bottles, hoses, and fermenters.