JSP Gold Precipitant 8 oz Refining & Recovery Test Acid Aqua Regia Metals SMB Pyrosulfite

This listing includes one 8 oz bag of JSP Sodium Metabisulfite (Na₂S₂O₅), a high-purity chemical commonly used in precious metal refining to precipitate dissolved gold from aqua regia solutions.

Sodium Metabisulfite is widely used by refiners and hobbyists during the gold recovery process to convert dissolved gold in solution back into solid metallic gold powder.

Also known as SMB, Sodium Pyrosulfite, and Disodium Metabisulfite, this reagent is a standard and reliable gold precipitant in the aqua regia refining process.

Product Details

• Product: Sodium Metabisulfite (Na₂S₂O₅)
• Weight: 8 ounces (½ lb)
• Purity: 99%
• Form: White crystalline powder
• Grade: Photo/Food grade

Common Use in Gold Refining

Sodium Metabisulfite is used to precipitate gold from filtered aqua regia solutions after the gold has been dissolved.

Typical usage guideline:

Mix approximately 1 ounce of Sodium Metabisulfite with 20–30 ml of water per ounce of gold dissolved in solution, then slowly add the mixture to the filtered aqua regia solution to precipitate the gold.

Ideal For

• Gold refining
• Precious metal recovery
• E-waste processing
• Laboratory and refining applications

If you have any questions about this product or refining supplies, please feel free to contact us. We look forward to serving you.