Large scale cyanotype directly on walls

[JulFhrr]

Hi,

I am currently trying to make a Cyanotype work on the walls of a room and running some test with wood covered with wall paint.

Some things I encountered:
1. the sensitiser turns to a light blue before it is exposed to light.
2. the unexposed areas turn a darker blue while the exposed areas don't really change in darkness and stay that light blue.
3. when I used vinegar in the washing process the exposed areas turn darker while the unexposed areas also turn darker, but the color shades differ.

I guess there are already some chemicals in the wall paint that kind of kick of a reaction, so the sensitiser turns blue before being exposed.

Maybe anyone researched the process or similar materials already and perhaps encountered similar things?

 

[nmp]

I don't have any direct experience with cyanotype on walls, but perhaps you can use some sort of clear topcoat to provide a sufficient barrier for the cyanotype chemistry to the the paint underneath.

:Niranjan.

 

[Daniela]

Any updates on this project, OP?
Never tried cyanotypes on wood/paint, but I'd be interested. I've gotten inconsistent results on canvas and different papers, so I agree that the chemical composition of whichever base you're using has an effect on the final results. It's all a matter of trial and error.

 

[gone]

The walls may be water based acrylic vinyl, that's the norm. If it's an old home it could be just about anything including oil paint.