Optimizing pouring of gold and silver bullion bars

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Traderdoc

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Jul 19, 2021
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Hi there

I have also placed this message in the silver thread.

I'm wondering if anyone is able to help. The knowledge that I've seen on this forum is startling so I'm sure some experts on here might have some idea of what I have.

I've just started the very fascinating hobby of pouring gold and silver bars. I have done a number of silver bars so far but have noticed this white "staining" on the top of all. My bars. I'm melting the metal in graphite crucible so was thinking that it might be graphite dust that has settled on the top.

In order to try and get this staining off the bars I placed them in a rotary tumbler for 24 hours. It didn't make much difference and the staining is still there ( see 2 attached images).
Anyone know what this is, how I can get rid of it and how I can prevent or lessen it in my future pours?

Thanks so much for any insight.

TD.
 

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Hartbar

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May 6, 2021
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I’m far from an expert on this, but on the top bar it looks like flux from your melting dish carrying over with the molten silver into ingot. Borax or Boric acid. I glaze my ceramic melting dishes with borax and have had same problem. I put the bars that have flux on them in warm sparex jewelers pickle for a couple of hours, it normally works it off. The bottom bar looks like you have impurities in your silver.
What’s your process for refining?
 

Traderdoc

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Jul 19, 2021
Messages
4
Thanks for the reply.

I actually don’t use any flux when I melt my metal. I just melt it directly in the graphite crucible.
I haven’t yet tried to delve into the refining side - I am purchasing what I’m told is .999 silver from a large refinery.
Is there a possibility that the refiners might have some contamination of the metal they supply? Is this a common issue with commercial refineries?
I’m hoping that’s not the case as I have struggled for many months to find a refinery in Canada who would supply me smaller amounts (around 50 to 100 ounces at a time) at a reasonable price.

Don’t quite know what I should do next?
 

FrugalRefiner

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So, what is your purpose?

If you're buying 999 silver from a large refinery, what value are you adding that provides you a means for a profit? Perhaps I'm just missing something. My apologies if I am.

Dave
 

Traderdoc

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Jul 19, 2021
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I've watched a number of individuals online pouring Silver and because I've been a precious metal stacker since 2000 I thought it would be great to see what producing bars from shot or scrap would be like. I'm always up for a challenge and pouring metals seems to be quite a challenge technically. I would like to add totally unique bars to my collection.
In time, f I get good enough, I might consider selling them if there was a market - when precious metal prices are a lot higher from where they are currently.
 
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