I’ve used hard silver solder with bronze, and brass, and the seam is
The brass was a yellow brass, but the bronze was 90/10.
I’ve also soldered fine silver to 90/10 bronze with hard silver
solder, but it was a sweat solder so a seam wasn’t an issue.
I also did a mokume of fine silver and 90/10 bronze, but used no
solder, just heat and a hammer.
Regards Charles A.