4metals said:Fire assay isn't for high grade refined silver, nor is the Volhard titration or the Gay Lussac titration. Usually high grade refined metals are run by difference where the impurities are quantified by AA or ICP and subtracted from 100%.
4metals said:Fire assay isn't for high grade refined silver, nor is the Volhard titration or the Gay Lussac titration. Usually high grade refined metals are run by difference where the impurities are quantified by AA or ICP and subtracted from 100%.
snoman701 said:Ok, so the biggest reason I'd like to know, is because until I know that my silver is 3N, I can't stamp it.
Potentiometric Titration
What kind of cost am I looking at to get set up to run this?
snoman701 said:I can stamp steel 24k gold as long as I don't get caught.
There are gov't guidelines for fineness...but it is up to the individual mint or refiner to ensure that their product maintains quality control, to maintain that fineness. I am not sure how serious the FBI and FTC are about enforcement, but I'd rather not find out.
But yes, it is legal to stamp our own. You must do so with a trademark or legal name that is registered to you. That is, I can't just stamp .999 silver, without stamping .999 fine silver, snoman mint...and have that trademark registered in my name.
Are you sure? I can't see any way to get purity based on that cell. It is a clever way to relate ampere to mass and my guess is that they are using quite pure silver nitrate in the cell to get a reproducible standard.Iggy-poo said:The theory behind the Silver Voltameter may be found here and related publications. The Silver Cell was used by the National Bureau of Standards to determine the value of the Ampere, thus the amount of Silver deposited with a known Current over time may be used to calculate the purity of the Silver. With an accurate current meter and scales, it is currently a simple process.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1091173/pdf/pnas01946-0074.pdf
g_axelsson said:Are you sure? I can't see any way to get purity based on that cell. It is a clever way to relate ampere to mass and my guess is that they are using quite pure silver nitrate in the cell to get a reproducible standard.Iggy-poo said:The theory behind the Silver Voltameter may be found here and related publications. The Silver Cell was used by the National Bureau of Standards to determine the value of the Ampere, thus the amount of Silver deposited with a known Current over time may be used to calculate the purity of the Silver. With an accurate current meter and scales, it is currently a simple process.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1091173/pdf/pnas01946-0074.pdf
Can you make a list of the steps needed to measure fineness?
Göran
Topher_osAUrus said:snoman701 said:I can stamp steel 24k gold as long as I don't get caught.
There are gov't guidelines for fineness...but it is up to the individual mint or refiner to ensure that their product maintains quality control, to maintain that fineness. I am not sure how serious the FBI and FTC are about enforcement, but I'd rather not find out.
But yes, it is legal to stamp our own. You must do so with a trademark or legal name that is registered to you. That is, I can't just stamp .999 silver, without stamping .999 fine silver, snoman mint...and have that trademark registered in my name.
Wouldn't it be easier to just sell the silver to me? :mrgreen:
In that text they started with "Silver shot, said to be 99.999% pure by the manufacturer", how would unknown contaminants affect the procedure?Iggy-poo said:Here's a good starting point. The references provided should give you all the information you need. Additional references are available with a simple search at NIST.gov:
http://nvlpubs.nist.gov/nistpubs/jres/84/jresv84n2p157_A1b.pdf
snoman701 said:TONS...but I want to coin.
g_axelsson said:In that text they started with "Silver shot, said to be 99.999% pure by the manufacturer", how would unknown contaminants affect the procedure?Iggy-poo said:Here's a good starting point. The references provided should give you all the information you need. Additional references are available with a simple search at NIST.gov:
http://nvlpubs.nist.gov/nistpubs/jres/84/jresv84n2p157_A1b.pdf
If I get you right you would dissolve silver then by electrolysis plate it back onto a platinum cathode? Are you integrating the current or weighing the cathode afterwards?
Göran
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