johnpotts2nd
Member
- Joined
- Feb 12, 2020
- Messages
- 7
How much silver do I need to add to inquart 331.39 grams of 14K gold jewelry?
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Martijn said:The calculations in A21 and B21 are based on these assumptions: (don't shoot me) 1.44ml @ 70% gives 70 gram of "pure' nitric per 100ml acid, which would result in (1.44*0.7)=1.008 gram of pure nitric per gram base metals, but only to calculate with.
My 53% nitric has 53 gram of nitric per 100ml... so the 1.008 gram divided by 0.53 gives the number in B21.
Probably a way to simple approach, so please correct me if i'm wrong.
If these calculations or numbers are off, let me know what it should be.
Hello Martijn!You have 193,31 gr gold and 138.08 gr of silver and need to add 596,5gr to come to 6K
I have an excel sheet for that.
It keeps in account a factor of 0,95 because of karat gold being 1/2 karat lower than the stamp. According a video of streetips, if remember correct.
Its in dutch, but i'll translate and share it here.
Martijn.
As additional information, this formula works with any karat, even decimals. You can work perfectly by melting all the jewels you have and scanning by XRF the button or bar to know exactly its pure gold content. The % of gold or "law" is multiplied by 24, to obtain the karat, with decimals.Hello Martijn!
I learned from an old school jeweler a very exact formula to calculate the amount of silver/copper to add to get 6k gold.
1 Determine the karats of the gold to be quartered.
2 Subtract 6 from that number, the number 6 is always a constant.
3 The result of that subtraction is multiplied by the weight of your gold to be quartered.
4 The result of that multiplication is divided by 6.
So following the example of johnpotts2nd, we do the following:
14 - 6 = 8
8 * 331.39 = 2651.12
2651.12 / 6 = 441.85
441.85 are the grams of silver or copper you need to add to bring that 14k gold to 6k gold.
You can confirm that after melting you will have 773.24 grams of 6k gold, or what is the same, 193.31 grams of pure gold.
That is a nice how to-step plan to calculate it. Just like my spread sheet or any calculator for that matter, but just like with chemical reactions, I like to understand what I'm doing so I like to logically approach a mathematical equation. My first reply in this thread had a mistake. I forgot what was already in the alloy. i made the spread sheet for those large volumes of different carat jewelry I was expecting to magically arrive at my doorstep.Hello Martijn!
I learned from an old school jeweler a very exact formula to calculate the amount of silver/copper to add to get 6k gold.
1 Determine the karats of the gold to be quartered.
2 Subtract 6 from that number, the number 6 is always a constant.
3 The result of that subtraction is multiplied by the weight of your gold to be quartered.
4 The result of that multiplication is divided by 6.
So following the example of johnpotts2nd, we do the following:
14 - 6 = 8
8 * 331.39 = 2651.12
2651.12 / 6 = 441.85
441.85 are the grams of silver or copper you need to add to bring that 14k gold to 6k gold.
You can confirm that after melting you will have 773.24 grams of 6k gold, or what is the same, 193.31 grams of pure gold.
So karat gold inquarting will be the same as gf items too?I think he's talking about this one.
Gold Inquarting Calculator
Just compared multiple carats at multiple weights on the site and the sheet (with the correction on 1), and the one from goldenscrap is 0.001 % lower on most.
That's less than most scales have for accuracy.
So the sheet is fine, the site is fine witch ever you prefer.
I'll replace the first file in this post.
Martijn.
Yes and no.So karat gold inquarting will be the same as gf items too?
As said in previous post, yes after the base metals are removed.And yes I've used that website before. That's reason I asked. It has a calculator for " karat gold". Is this calculator the same for gf " gold filled" items?
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