mdengraver
~ Elite 1000 Member ~
I met an engraver in Colonial Williamsburg who put tincture f benzoin on the metal let it dry and transferred his image to it. It's a sticky resin that will grab your image from an already cut piece after some type of powder, etc is applied and make a stable transfer.
Tincture of Benzoin
http://equipped.outdoors.org/2011/05/sticky-situation-tincture-of-benzoin.html
Tincture of Benzoin
http://equipped.outdoors.org/2011/05/sticky-situation-tincture-of-benzoin.html