When made correctly, toned Kallitype prints are virtually identical to Platinum/Palladium prints and are just as archival. Arriving at basically the same point but through different means, Kallitypes are more labor intensive, but more frugal than Platinum Prints. The added dynamic of toning makes the Kallitype very variable. Between toning and various developers, a wide range of tones can be achieved, from warm browns to eggplant purples to charcoal blacks.
A combination of silver nitrite and ferric oxalate is used to coat the paper. A negative the size of the print is placed on the dried paper, exposed to UV light, then developed, toned, fixed, cleared and washed. These Kallitypes are toned in either Palladium or Gold. Essentially, these two “noble metals” replace the silver in the toning process, creating a more archival and stable final print.