I asked this question some time ago and got very helpful replies. If
I remember correctly the formula that I should use is for each gram
of the80% coin silver I should add 1.7 grams of fine silver.
However, I lost my original notes, and I hope this is correct.
A customer has commissioned me to make her a bracelet using the some
Canadian quarters minted between 1949 and 1960. I tried to dissuade
her from insisting on my using these coins, but she says they have
sentimental value and wants me to raise the content to sterlingand
use them in casting bracelet for her.
She is a steady customer, and a friend, so reluctantly I said I
would do it, but I want to make sure about my calculations. To each
gram of the 80% coin silver, I should add 1.7 grams of fine. Is this
Would rather just use sterling grain, but now I am committed to
using the coins.