You sure can do that with quite acceptable results, but the black achievable with the CMY dyes in colour paper doesn't quite measure up with that of a black pigment. There's also problems with metamerism, and it's difficult to get consistent/neutral grays. Slight colour shifts in a colour image are virtually unnoticeable, but in a monochrome picture they can become obvious.Originally Posted by Pablo
Unless I'm mistaken, the main difference in appearance is not so much due to platinum vs. silver, but the way it is coated. Gelatin-based papers embed the (silver) pigment in an emulsion, usually backed by another non-fibrous layer (polymer or baryta). With common platinum prints, there is no backing layer, i.e. the paper soaks up the chemicals, and the platinum pigment is dispersed in the paper fibres. This is similar to older types of silver prints.I have never seen a platinum print (maybe when I get back to Singapore you will show me some), so I can't compare.