Ammonium Chloride (AKA Sal Ammoniac) is often used in the recovery process of platinum metal (Pt) from catalytic converters. It is combined with water and used as a wash solution to precipitate scrap Pt dissolved in an aqua regia solution.
It is a clear white, granular, water-soluble crystalline salt of ammonia.
Used in the following patina formulas:
- No. 5 for Antique Green
- No. 8 for Cold Process Green
- No. 9 for Light Green
- No. 14 for Blue
- No. 17 for Deep Rust Red
- No. 18 for Purple
- No 20 for Red - semi-matt (For Copper & Copper Plate)
- No. 25 for Blue Green (For Cast Bronze)
- No. 27 for Blue Green - semi-matt (For Cast Bronze)
Ammonium Chloride readily forms colorless, cubic crystals. Read our article, "Growing Large Crystals with Seed Crystals" for more information.
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