Cyanotype over pt/pd

[Jarvman]

Hello All, Was hoping for some help on this. I've made some cyanotype over pt/pd prints this evening and have run into yellow highlight staining. The paper isn't washing back to white in the highlights. This is unlike what happened with a straight cyanotype test, which cleared back to paper white. What could be the cause of this? Is there a remedy or any way of avoiding this in future?

Cheers,
Gareth

 

[Jadedoto]

I've never done cyanotype over pt/pd before. I'd like to see what it looks like... My first thought is maybe there's a reaction between what is left from the pd/pt printing and the cyanotype chemicals. Looking up some old threads, it looks like there could be some reaction. But FAC is really soluble in water, so I don't know what it would stick to the paper like that. Is it completely staining and not washing out at all? (I'm looking at this: (there was a url link here which no longer exists) which may or may not help out all that much)

 

[photomc]

check with scootermm (Matt) here on APUG, he has some that worked very well - see them here