what is the formula for the nitric acid silver process

[r mason]

I would like to know what is the proper ratio to use with Nitric Acid and Silver is ?

 

[jimdoc]

I suggest you read this book;
http://goldrefiningforum.com/phpBB3/download/file.php?id=2480
It is kind of mandatory reading here.

Jim

 

[goldsilverpro]

It takes about 1.20 ml of 70% nitric (diluted 50/50 with 1.22 ml of distilled water) to dissolve 1 gram of pure silver. For 1 gram of copper it takes 3.4 times more (4.15 ml). If you have a silver/copper alloy, it is somewhere in between and, if you know the alloy, it can be calculated. For example, for a 90/10, silver/copper alloy, it takes (1.20 x .90) + (4.15 x .10) = 1.50 ml per gram.

These figures are quite close but can vary slightly depending on certain variables.