I desolved some in nitric verry hard from the 70s 0r the 80s from a gov sale long ago it left a precipate in the bottom whitch i filtered of looks like gold precip then added more water and some salt got silver precip whitch turned purple in the sun dont know wether it has any cadinum in it. dont know how to test it for cadinum!
silver solder
- Thread starter Brandt
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Barren Realms 007
In Remembrance
Sounds like you might have used tap water and produced some silver chloride, that is possibly what turned purple in the sun. Recomendation is to use distilled water.
Barren Realms 007
In Remembrance
Brandt said:
Don't feel bad it does it to me as well.
Barren Realms 007
In Remembrance
Oz said:
Yea I missed that some how. Thanks Oz.
Brandt,
I do not know what kind of silver solder you had but it is unlikely to contain gold in the alloy. By all means save and test it for values though.
As to cadmium, forget about testing for its presence for now (I know of no good method) but be aware of its hazards an how to eliminate it, know it goes into solution with nitric, and that silver cements on copper but cadmium will not.
Whatever you had in the bottom of your beaker that did not go into nitric now has some of your silver mixed with it as silver chloride. When you add a chloride salt (I imagine you used table salt) to a nitric solution that contains silver, lead, or mercury, you will form solids of these metals as their chlorides. What you should have done after digesting your silver solder is to remove the solids from your solution. Then you could have placed copper bar in your clean solution to cement your silver out, leaving any cadmium or other base metals behind in the solution. Careful washing of the cement silver would leave you with 98-99% pure silver.
If you wish fine silver you will have to learn about silver cells.
I do not know what kind of silver solder you had but it is unlikely to contain gold in the alloy. By all means save and test it for values though.
As to cadmium, forget about testing for its presence for now (I know of no good method) but be aware of its hazards an how to eliminate it, know it goes into solution with nitric, and that silver cements on copper but cadmium will not.
Whatever you had in the bottom of your beaker that did not go into nitric now has some of your silver mixed with it as silver chloride. When you add a chloride salt (I imagine you used table salt) to a nitric solution that contains silver, lead, or mercury, you will form solids of these metals as their chlorides. What you should have done after digesting your silver solder is to remove the solids from your solution. Then you could have placed copper bar in your clean solution to cement your silver out, leaving any cadmium or other base metals behind in the solution. Careful washing of the cement silver would leave you with 98-99% pure silver.
If you wish fine silver you will have to learn about silver cells.
