Chris and son Osian

Cyanotype as extra.

These are great fun to do. Just tweek the picture so it has a bit more contrast, flip horizontal and invert (turn into a negative). Then print onto inkjet transparency (acetate). 

Coat watercolour paper with Cyanotype solution (mixed  1:1 partA+PartB) and allow to dry. 

Expose paper/neg to about 30 mins light (doesn't matter if overcast) and wash paper - bingo!

https://www.stylist.co.uk/home/how-to-cyanotype-print/533160

(I would wear gloves though!)