the book the Jewelers bench reference has all alloys of gold listed
on a very concise page. since I am not at the location where the
book is, perhaps you can just as easily locate it online at
Amazon.com, abebooks.com, or alibris.com. It is out of print but
various institutions still sell it in their bookstores ( john C.
campbell folk School, Brasstown NC for instance). I have a few, and
will sell you one if all else fails. Otherwise not only is it an
essential volume to own, but the alloy you are loooking for is there
and from all the tests I have made on the formularymthe metal weights
are in correct proportions for the colour required. I will be back in
studio on March 4th if you haven’t located it yourself before then. I
use the damned thing weekly and can’t remember the name of the author
offhand…Mardi Gras is to blame I supose!