Martijn
Well-known member
I read your post again and what you have will certainly not be silver nitrate in with the foils after treating only with nitric acid. Unless you diluted with tapwater.
Then tin paste, also known as metastannic acid will be more likely.
Silver nitrate is very soluble in water and in nitric acid. Add a bit of HCl or table salt solution to a bit of the nitric leach solution and silver will form as silver chloride. If there was any silver, it will be there. Not in the filter.
Or you could test with clean copper to see if any silver cements out.
To get rid of tin paste, you need to pyrolyze, incinerate and leach the tin out with HCl.
Going straight for AR will also work, but is hard to filter.
Then tin paste, also known as metastannic acid will be more likely.
Silver nitrate is very soluble in water and in nitric acid. Add a bit of HCl or table salt solution to a bit of the nitric leach solution and silver will form as silver chloride. If there was any silver, it will be there. Not in the filter.
Or you could test with clean copper to see if any silver cements out.
To get rid of tin paste, you need to pyrolyze, incinerate and leach the tin out with HCl.
Going straight for AR will also work, but is hard to filter.