Cyanotype washing help

[Tanniya]

Hey!

I’ve been doing Cyanotype for a while now, but some new stuff is happening. Whenever I’m washing my fabric after exposure in water, there’s blue getting deposited in where white should be the highlight, and it’s taking a lot of rigorous water bathing, soaking (3-5 hours) in a tub and more agitating the cloth for that blue to wear off. Even then, very little remains, and if I put it out in the sun to dry, it goes away (but not when there’s too much blue).

 

I haven’t changed my due, fabric, technique, exposure or any other factor. I cannot wrap my head around this. 
 

anyone knows what I’m talking about? 

[rodeo_joe1]

I seem to recollect iron (rust) contamination can cause blue spots or a blue deposit where it shouldn't be. 

Maybe your water supply is picking up iron, or some other metallic contamination from rusty pipes or something? You could try distilled water at various stages of the process. 

Edited November 5, 2022 by rodeo_joe1