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Karat Alloy Mixer
Tell it what metal you have and the karat you need — it tells you exactly how much fine gold or alloy to add, down to the milligram.
A customer's old 18K chain comes back over the counter and the order in the book is 22K. How much fine gold goes in? Guess high and you have given away gold you will never see again; guess low and the piece reads under 916 at the hallmarking centre. Most benches settle it with a thumb rule and find out after the melt.
What it will do
- Work out the fine gold to add to raise any old-gold weight to 916, 750 or 585.
- Go the other way — the grams of alloy that bring 999 fine down to your target karat.
- Start from tested tunch rather than the stamp, so an old-gold mix begins from the truth.
- Size a batch backwards from the finished weight you need, fine gold and alloy both.
- Carry a melt-loss and solder margin, so the finished piece still clears its mark.
Who reaches for it: Anyone who melts and mixes at their own bench — small manufacturers, exchange-heavy counters, silversmiths, and jewellers who issue metal to a karigar.
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Karat Alloy Mixer — like every tool on the roadmap, and every future tool added to the bench — is part of Tools Pro Lifetime. One payment, forever. AI photoshoots stay on credits.
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How much alloy do I add for 22K gold?
Work from the fineness, not the karat. 916 means 91.6 g of fine gold in every 100 g of finished metal, so 100 g of 22K is 91.6 g fine plus 8.4 g alloy — or, starting from 100 g of pure gold, about 9.2 g of alloy added to it. For 18K (750) that is 33.3 g of alloy per 100 g of fine gold, and for 14K (585), 70.9 g. The alloy itself is usually copper and silver, proportioned for colour.
How do I raise 18K old gold to 22K?
Count fine metal, never gross weight. 10 g of 18K holds 7.5 g of fine gold, and reaching 91.6% takes roughly 19.8 g of pure gold on top of it — nearly two grams of fine for every gram you started with. The rule: gold to add = weight × (new purity − old purity) ÷ (1 − new purity). Raising karat is expensive; lowering it costs only a little alloy.
My mix was 916 but the piece failed at the hallmarking centre — why?
The centre assays the finished article, solder and all. Jointing solder runs a karat or two below the body, so a piece with many joins reads lower than the metal it was mixed from, and melt loss and stray filings pull the same way. 916 is a minimum, not a target — benches answer this by mixing a shade rich and keeping solder to the least the joint needs.
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