Recent content by Jan de Jong

My goal is to have the normal cyanotype improved by adding some copper-sulfate, it seems to work in the 2 pass process with the diluted FerroBlend keeping the details and keeping the print blue. So my objective was to do it in a single pass. I tend not to use chromates or oxalic for safety...

@Raghu Kuvempunagar Seeing the effect that the FerroBlend will retain even faint exposed parts of the print, ie no wash-off or bleaching, I tried some experiments to make a one-stop-shop ie add the sodiumcitrate and some copper sulfate direct to the emulsion. Just to reveal, it did not work...

Just to verify, you want to develop a c41 color film in black and white developer, then let it dry, make some scans for example and then bleach it, and do the color development so you end up with "normal" c41 negative, correct ? This is what I did, for the first developer on experiments I...

You may want to check what I have posted on using tartaric acid instead of the thiosulfate . Iron-Copper a direct positive image looking forward to your post on this.

Agree, This is a drop taken direct from the FerroBlend developer,, no dilution. Mount with cover slip. Yes looks like paramecium, but looks to be physical effect of the liquid only. I am sorry for my free interpretation of that. I will do some further observations with the new 200ml I made...

Checking a bit further with the microscope, there is no known organism that grows in 2% copper solution. It seems to be an alignment of the sodium citrate and the copper sulfate mix that happens after some days. It makes coating easier, still I also prepared some new which is fully liquid again...

From 2022, here my result then, with FAC and Copper sulfate only. left after exposure, right after wash. What remains is the reacted FAC on the paper, the copper seems to wash off mostly without Thio. See the right picture on the top part. Also the overall was washed out. Intuition would say...

Thank you, I like the result also, has good clearing of the whites and very good darks, It does not get as dark as in my FerroBlend image of "the library" but it is close. Good question on the proportions, I think next steps would be to make some test prints with 1) no Thiosulfate, 2) smaller...

Today lots of sun so started exposure this morning at 9-11, on some fresh Hazeltree leaves. The paper was coated earlier this week. This seems to be good. In any case if stored dark this emulsion should hold months or longer. Just adding it here to show the K-Ferri/K-Kerro + citric acid is a...

Thank you for the link, very interesting. it gives a nice overview of the possible things that can happen. This is similar way of working I did to come to the process in the first place. I took a set of test tubes with combinations outside in the sun while reading a book in my garden. My goal...

The assumption in the pdf article if I take a shortcut that it was more an adhesion of chemicals rather than a solid forming, indicating that direct after exposure not a dark color of the emulsion would support that. That was the reason why I wanted to revisit it. For that reason I posted in...

Interested by the pfd by Vincenzo, I wanted to do some quick tests, to see if we have a process only reacting with the paper fibers or a solid forming somehow. I wanted to make a strong solution and keep it simple for my test. I think my initial recipe was more 2gr FAC 1 gr copper sulfate and...

Yes, next on my list. First will try with some simple things to see how the 2 layers behave. Yes would certainly work, since it retains the delicate shades. Just the seeding flowers are delicate. Il give it a try. Looks to me perfect for bigger leaves also. I'll add some results when ready...

You could try if you can "develop" to a darker tone with a mix of 3 gr K-Ferri 3 gr K-Ferro some citric Acid (ph has to be below 5 or so) in 300 ml of water. This has given in many of my copper related processes a good reaction.

After the massive number of reactions here 😎 I'd just like to share a little variation. It started while in the making of some further FerroBlend images, I brush the blend on in a tray which I then continue to use to rinse later. However I did not notice the tray still had water in it, so the...