[Alt-photo] Mike ware cynaotype - help needed

Christian Nze christnze at gmail.com
Tue Jun 5 15:01:12 UTC 2018


Hello Cyril

Everything look perfect. you may take care of the solution's temperature.
if you want more information you can contact me directly and in french.

2018-06-05 15:49 GMT+02:00 Cyril ANDRE via Alt-photo-process-list <
alt-photo-process-list at lists.altphotolist.org>:

> Hi everyone,
>
> I have a question regarding the Mike Ware’s cyanotype formula.
> I’ve made a batch of solution in order to make 750 ml of cyanotype.
>
> Unfortunately I surely made a mistake because the solution is very dark,
> more emerald green toward strong blue than the olive-green I usually have.
>
> When I tested the solution on Berger COT320 paper, it ended up turning
> green almost immediately…
>
> However, after the development process the result seems good, but I don’t
> feel comfortable at all with the solution I made, I don’t want my prints to
> end up bad in the future.
>
> Would you please help me understand what turned bad?
>
> This is the recipe I made for a final 750 ml solution:
>
> • Potassium ferricyanide = 75 gr.
> • purified water = 150 ml
>
> • Ammonium Iron (III) oxalate = 225 gr.
> • purified water = 225 ml
> • Ammonium dichromate = 0.75gr.
>
> The two solutions were very hot when mixed together and then left overnight
> to crystallize.
> • The amount of crystals after decantation was about 105 gr.
> • The amount of filtrated liquid was about 450 ml.
>
> I made up the filtered solution with purified water to make a total of 750
> ml solution.
>
> As you can see, I multiplied the compounds by x7.5 the initial recipe.
> Did I make a rookie mistake?
>
> Many thanks for your help.
>
> Cyril
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> Alt-photo-process-list | altphotolist.org
>



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Christian Nze
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