Anyone have experience using Iodine in Ceramic work?

[blackthorn]

I'm still chasing processes for imaging on clay and have come across another process.  Much like standard cyanotype but uses Ferric Ammonium Oxalate instead of the Citrate form and, it subs Anhyrdrous Ferric Chloride  instead of Potassium Ferricyanide.  So far, still using Iron salts.  However, after a lengthy exposure, it is developed with Potassium Iodide instead of plain water.  

The fellow who introduced me to the process says the Iodine seems to replace the Iron, which is not an encouraging outcome for my purposes in firing.  I'm going to test it anyway, but meanwhile, I'm wondering if any here have ever used Iodine in any formulas.  Other than medically of course. 

I've attached an example of my comrade's process on glass.

[Min]

Sounds interesting (like all your work), keep us posted how it goes!

[PeterH]

Interesting ...

This may be the same reaction
New Positive Siderotype Process using Iodine/Starch Colorant
https://tinyurl.com/5zda5fmv

This "development" process looks like a variant of the starch/iodine test, and IMHO the iodine complex is pretty sure to burn out.

Just FYI

Sanity check: Iodine does  indeed form a blue complex with  PVA (which is in the Elmers glue used in first reference).
 https://link.springer.com/chapter/10.1007/3-540-56579-5_3?noAccess=true

[blackthorn]

Peter- I agree with your suspicion that the iodine will burn out.   The iron from a typical cyanotype is tenuous enough in high fire, so my expectation is for it to vaporize.

Otherwise, I've been working with over exposing regular cyanotype to the point of solarization.  It's an interesting look on bisque but I've yet to see how it will survive cone 10.

Today's test is below, and is my commentary on the past two years.

 

[PeterH]

3 hours ago, blackthorn said:

It's an interesting look on bisque but I've yet to see how it will survive cone 10.

Nice, and very haunting.

There does seem to be an issue in getting enough iron deposited to form a good image when fired, let alone high-fired.

I came across this thread which may be of interest
How to improve density in Cyanotypes?
https://www.photrio.com/forum/threads/how-to-improve-density-in-cyanotypes.175947/
... I haven't read it all, but it contains interesting snippets such as

This tonal reversal is the phenomenon of ‘solarisation’ first observed and named by Herschel. It is actually desirable for making a print-out image, because it can ultimately yield a higher maximum density: the self-masking action by the Prussian blue in the shadow regions of a printed-out image is diminished by the reversal to white, which allows the ingress of more light and formation of more (white) product. After the exposure, the Prussian white so formed is oxidised back to Prussian blue, either slowly by the oxygen of the air, or more rapidly by including a bath of an oxidising agent, such as hydrogen peroxide or a dichromate, in the wet-processing sequence: Prussian white + hydrogen peroxide ---> Prussian blue + hydroxide ions.
... my emphasis

It also mentions Mike Ware, who I hadn't heard about before. He is "a chemist and photographer who has spent part of his career updating old photographic processes". As he is a member of the Royal Society of Chemists this looks like it would be an in-depth study.
wiki: https://en.wikipedia.org/wiki/Mike_Ware_(photographer)
Home page: https://www.mikeware.co.uk/mikeware/main.htm
The new cyanotype process: https://www.mikeware.co.uk/mikeware/New_Cyanotype_Process.html
406-page downloadable book on the cyanotype process (including lots of history):  https://www.mikeware.co.uk/downloads/Cyanomicon.pdf