sensitizer formula by Christopher James, Alternative Photographic Processes, 2nd ed., p. 234
3 drops Tween 20 5% / 3 ml sensitizer
(Note: without tween 20 the image is flat, grainy and lacks contrast)
work in progress (blog)
My penny plain contact print frame, front and rear view.
A glass plate, cardboard of the same size as the glass, 4 clamps and some tape.
The cardboard is cut halfway through and reinforced on the back by some tape.
Open contact print frame for inspection of progress.
Some links to more elaborate DIY constructions:
Use adjustable coathangers and hang the sensitized paper in a coat closet protected from light .
This technique is especially usefull for sensitized textile. The lower hanger may be weighted for stretching!
An alternative is to use a paper box with an iron plate at the base. Small magnets keep the paper in place and prevent buckling (depends on number of magnets and the humidity of the paper). Be carefull not to touch the sensitized part and cover the iron plate with some plastic (e.g. plastic bag) to prevent unwanted chemical reactions.
positive cyanotype brownprint
negative cyanotype brownprint
Digital photos to this series on photodiary.
Guy Meder: “Wann d’Hinnesche de Kapp hänke loossen, sinn d’Lueden zou.”