Platinum and Palladium Printing
Historically considered the premier, treasured, hand-coated emulsion among photographers, platinum and the closely related palladium printing processes are two of the tonally richest and most permanent emulsions available. Depending on the paper and processing procedures used, the more expensive platinum can yield cool velvety blacks, while palladium renders warmer blacks and sepia browns. Although both processes are probably the most costly hand-coated techniques covered in this book, they can be combined with each other as well as with gum bichromate (Chapter 9), Cyanotypes (Chapter 7), and other techniques. The advantage of gum printing is that if you do not like what you created, you can remove it, whereas cyanotype is permanent.