A word about the medium:
The kallitype is an historic process originating in the 1880s, before the advent of modern photographic papers. A kallitype is made by painting silver and iron salts onto watercolor paper, and then exposing the paper and negative to ultraviolet light. It is a cousin of the other historic processes that use iron salts to create images: Vandyke brown prints, cyanotypes, platinotypes and argyrotypes.
The kallitype process, once mastered, gives the artist a long tonal range and great flexibility as to the final print's appearance. Toning agents may be used to replace the silver with nobler metals — platinum for neutral tones, gold for colder tones, palladium or selenium for warmer tones. I have used platinum for this series.
A toned kallitype is archival, and will likely outlive its viewer.