colored cyanotype

[Ślepy Fotografer]

two-color cyanotype, from two negatives, yellow and blue-green, toning and bleaching, exposure time from 10 to 30 minutes for a yellow negative https://flic.kr/p/2naAZY5

 

[Ślepy Fotografer]

Nice. Let us know how you did it.

from two negatives, yellow and blue-green, toning and bleaching, exposure time from 10 to 30 minutes for a yellow negative

 

[radiant]

from two negatives, yellow and blue-green, toning and bleaching, exposure time from 10 to 30 minutes for a yellow negative

Absolutely lovely print!

How do you maintain two colors on same paper? Can you describe the process step by step?

 

[Helge]

That’s almost a subtractive colour process. Now you “just” need some kind of magenta.

 

[Donald Qualls]

How do you maintain two colors on same paper?

My presumption is that the bleached layer (yellow) is the first one laid down, and the unaltered blue printed over it.

 

[Ślepy Fotografer]

that's exactly what it is

 

[mohmad khatab]

Something like this happened to me a few days ago by pure chance,
It was a black and white Foma 100 film, and I used the process ORWO-4185-e. I took a macro shot of the wristwatch, and the background was a white sheet of paper.
The result is very strange.
The image was positive, but it turned into white and brown and the white background turned into a yellow background.
Unfortunately, I got angry at the failure of the operation, and in a moment of anger I got rid of that negative (positive)
If I had known that this nonsense I did was a good thing I would have kept that negativity

 

[radiant]

Something like this happened to me a few days ago by pure chance,
It was a black and white Foma 100 film, and I used the process ORWO-4185-e. I took a macro shot of the wristwatch, and the background was a white sheet of paper.
The result is very strange.
The image was positive, but it turned into white and brown and the white background turned into a yellow background.
Unfortunately, I got angry at the failure of the operation, and in a moment of anger I got rid of that negative (positive)
If I had known that this nonsense I did was a good thing I would have kept that negativity

I think multicolor negative is not needed. The printing is done in two parts with two different negatives in this case.

 

[sionnac]

That is great!! Nice work.

 

[pentaxuser]

radiant may well understand this process step by step now but I need more help. What are yellow and blue green negatives?

"My presumption is that the bleached layer (yellow) is the first one laid down, and the unaltered blue printed over it."

What does your above quote involve? Donald

Thanks

pentaxuser

 

[Donald Qualls]

@pentaxuser I based that on the fact that bleaching (by whatever means) will bleach all the Prussian blue on the paper, so the unaltered cyanotype layer would have to be printed over the bleached/colored one. Nothing more. I'm still curious how the yellow layer is colored -- I'm familiar with tannic acid toning of cyanotype, with or without bleaching, but I don't recall this color from that.