Paper- Ilford MGIV or Forte warm tone.
Black and White gelatin silver paper exposed under the sun for long periods of time, hours and sometimes days. With objects of all kinds placed on them.
When the paper colour is appealing the water is fixed, washed, hyper cleared and archivally washed as per a normal black and white print. With one exception- the print never touched the developer. (possibility of hand colouring with photo oil).
(use a light box and develop at a later date or time in a darkroom is not instantly accessible)
Information taken from chapter two- The Experimental Phtotography workbook, Christina Zanderson?