Cyanotype. Final solution gets blue without UV.

Igorrogi said:

Final solution gets blue with out UV.

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pentaxuser said:

You need to tell us more about your process such as which chemicals and pictures of what has happened without U.V. before we can really help

pentaxuser

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koraks said:

At what point does it turn blue? Directly upon mixing, after a certain time of storage, or when being applied to paper?
How long did you store the final solution?

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VinceInMT said:

It it turns blue on the paper without UV it is likely something in the paper. I’ve had that issue.

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Igorrogi said:

Turns blue staight after mixing. Before apply on the paper.

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nmp said:

Looks like your FAC is compromised somehow (UV exposure, heat, etc) producing ferrous ions which would react with ferricyanide in solution making it blue. Get a new supply if you can or follow the procedure discussed in this thread (with appropriate precautions) and see if you can make the current one work:

Classical cyanotype sensitizer solution leaves powdery blue-green residue

Hi good people! I am relatively new to the classical cyanotype process. I have mixed my chemicals before but am facing a new problem. My Solutions A and B look alright on their own (25g FAC and 10g Pot Ferrocyanide each in 100cc distilled water). However when I mix them to make sensitizer a...

www.photrio.com

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Igorrogi said:

Directly upon mixing. It takes around 30 seconds.

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koraks said:

Verify that you in fact have ferricyanide (CAS 13408-62-3), and not ferrocyanide (CAS 13408-63-4). This mixup has occurred in the past if memory serves, and it gave similar problems.

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