Gold and silver alloy mixer for karigars
Choose the carat and the colour, and see how much pure gold and how much of each other metal to weigh in. It adds the melting loss, or tells you what to add to gold you already have.
Free, with no sign-up. It runs on your phone or computer, and nothing you type is sent anywhere.
In percent. 22 carat is 91.6, 18 carat is 75, 14 carat is 58.3.
Colour
Mostly copper with a little silver. The other metals are shared 89% copper and 11% silver.
The weight you want to have after melting.
In percent of what goes in the pot. Your own figure from past melts is best.
24 carat bar or grain is usually 99.9.
Per gram. Adds the value of the loss to the result.
Weigh into the pot
100.503 g
To end with 100.000 g of 75% gold (18 carat)
- Pure gold
- 75.1% of the mix
- 75.452 g
- Silver
- 2.7% of the mix
- 2.756 g
- Copper
- 22.2% of the mix
- 22.295 g
- Total in the pot
- 100.503 g
- Expected melting loss
- 0.5% of what goes in
- 0.503 g
- Pure gold inside that loss
- If it is lost evenly from the whole mix
- 0.377 g
- Pure gold in the finished metal
- 75.000 g
Know where every gram went
Sarraf AI records the metal you give a karigar and what comes back in fine weight, and shows the loss against what was agreed.
Start 7-day free trialHow an alloy is worked out
Purity is the share of pure metal in the whole weight. 18 carat is 75%, so 100 g of it holds 75 g of pure gold. The other 25 g is the alloy: silver, copper, zinc or palladium. Which metals, and in what share, decide the colour.
- New batch: pure gold = finished weight x purity wanted / purity of the pure gold. The rest of the pot is alloy, split by the colour you chose.
- Gold you already have: to bring 22 carat down to 18 carat, keep the pure gold the same and let the weight grow. 50 g at 91.6% holds 45.8 g of pure gold, which is 61.067 g at 75%, so add 11.067 g of alloy.
- Going up in carat: when the gold you have is poorer than you want, there is nothing to take out. Add pure gold instead.
Melting loss
Some metal is always lost in the pot. The calculator treats loss as a percent of what goes in, so to end with 100 g it weighs in a little more than 100 g. Use your own figure from past melts.
Tips
- Weigh each metal on the same scale, and write the weights on the slip.
- The colour shares are common starting points. Every workshop adjusts them, so try a small batch first.
- Check the touch of the finished metal before you make jewellery from it.
Questions people ask
How much pure gold is in 18 carat gold?
18 carat gold is 75% pure gold. So 100 g of 18 carat gold holds 75 g of pure gold and 25 g of other metals. 22 carat is 91.6%, 20 carat is 83.3% and 14 carat is 58.3%.
What do I add to make rose gold?
Rose gold is gold with a lot of copper and a little silver. A common 18 carat rose gold is 75% gold, 22.25% copper and 2.75% silver. The calculator shares the non-gold part 89% copper and 11% silver, and uses the same share for other carats.
How do I make yellow gold?
Yellow gold uses about equal parts silver and copper for the non-gold part. 18 carat yellow gold is commonly 75% gold, 12.5% silver and 12.5% copper. More silver gives a paler, greener yellow. More copper gives a redder one.
What about white gold?
White gold is gold alloyed with a white metal. The cleanest recipe is 75% gold and 25% palladium for 18 carat. Many workshops use mixes with nickel, zinc, copper and silver instead. Use the Custom colour to enter your own shares. White gold is usually rhodium plated for a bright white.
Why does the pure gold weigh a little more than the fine gold I need?
24 carat grain is usually 99.9% pure, not 100%. So the pure gold weighed in is a touch more than the fine gold needed. Change the purity of the pure metal if yours is different.
What melting loss should I use?
It depends on your furnace, how much you melt, and your skill. Use the figure from your own past melts. The default of 0.5% is only a starting point. Filing, polishing and casting lose more than melting does, so use the wastage calculator for those.
Is the loss gold or alloy?
In practice the loss is a mix of fine gold dust left in the crucible and lighter metals that burn off. The calculator assumes it comes evenly from the whole mix, which is the careful way to count it. Your real result may differ, so weigh before and after.
Can I use it for silver?
Yes. Choose Silver. Sterling silver is 92.5% silver and 7.5% copper. The calculator works out the pure silver and the copper to weigh in for 92.5, 90, 80 or any other purity.
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