Ambrotype n. (Photog.) A picture taken on a plate of prepared glass, in which the lights are represented in silver, and the shades are produced by a dark background visible through the unsilvered portions of the glass.
... I knew a man from Vermont who had just organized a sort of restaurant, where he could go and make a very comfortable breakfast on New England rum and cheese. He borrowed fifty cents of me, and askin' me to send him Wm. Lloyd Garrison's ambrotype as soon as I ... — The Complete Works of Artemus Ward, Part 2 • Charles Farrar Browne