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They tend to work best with black and white images, but you can print color on them if you don't mind strange colors. Better for still lifes or landscapes than portraiture if you're using color.
Interesting. I never have seen one print on this kind of paper. As the matter of fact, right before I was about to return the papers, I stopped and thought about B&W printing. Now I may give it a try.
For color, what kind of images would be good for gold, for silver? hard to think.