I applied the same chemicals to the watercolour paper as when cyanotypes were established in 1842. This was done in near darkness using broad strokes (these are evident in final print.)
The paper I use is a heavyweight watercolour Bockingford 300 gms and after chemical is applied I allow it to dry in total darkness for some hours.
The image is then made with Uv light. I do a series of test strips to work out correct exposure time.
Each image is unique as the chemicals are never applied exactly the same. There will be only 10 cyanotypes pf this image available in A4 size and 10 in A3.