Ingot Moulds

The proportion of precious metal in an alloy is measured in parts per thousand by weight. Previously the number of parts called carats, of precious metal in 24 parts of alloy was used for example, 22ct gold is an alloy in which 22/24 or just over 916 parts per 1000 are pure gold.

Gold 916.6 (22ct)
Gold 750 (18ct)
Gold 585 (14ct)
Gold 375 (9ct)

Guide to preparing your ingot moulds before casting;
1. Place your ingot mould on a refectory board. Heat your ingot with a gas torch uniformly for about five to fifteen minutes. For best results heat the ingot to a cherry red colour.
2. Sprinkle borax powder into the grooves/crevice evenly just enough to cover surface of the ingot. For adjustable ingots sprinkle the borax before this process.
3. Carefully pour the molten gold/silver into the ingot mould.
4. Leave the ingot to cool down naturally. If you immerse the ingot in water to cool there is a risk that the ingot itself could crack.
5. If the gold/silver ingot gets stuck tap with a mallet (M4752) and it will drop out. Using a metal hammer increases the probability of shattering the ingot.
6. To clean off fire stain and oxides put the ingot into pickling or sulphuric acid.
7. Stamp your ingot with marking punches 9ct, 22ct etc

All capacities are approximate and are based on 24ct pure gold.
Please remember that there is always an element of wastage involved with melting.
Ingot Moulds

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