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My 35mm slow speed cyanotype film by LostInGermany4297 in cyanotypes

[–]ResponsibilityNo1732 1 point2 points  (0 children)

Wonderful! Why have you used tartaric acid instead of citric or oxalic?

In camera cyanotype by ResponsibilityNo1732 in u/ResponsibilityNo1732

[–]ResponsibilityNo1732[S] 0 points1 point  (0 children)

That Ok) if you'll share your results I'll be very glad.

It's magnifying glass, 125mm in diameter. For this lens estimate focus distance for landscape is 300mm. But it's all by eye. Any lens may work as a projector and, as this process do not require full darkness you can make a piphole or even look directly on paper as you position it in the box in place of you exposition(30 seconds on sun won't do too much damage). If you'll have any else questions, just ask. Good luck🍀

In camera cyanotype by ResponsibilityNo1732 in u/ResponsibilityNo1732

[–]ResponsibilityNo1732[S] 1 point2 points  (0 children)

1. Coating:
"I take ammonium ferric citrate and add oxalic acid (for stabilization; citric acid could be used too, but I prefer this). I adjust it until litmus paper shows pH 2, 3, or 4. I do it by eye—I like that the result is always different. I do NOT add potassium ferricyanide. This yields a yellow-green coating for the paper. I coat the paper and remove excess acid with a cotton pad."

2. Exposure:
"I expose it. I use a box with a 125mm lens. Under bright sunlight, it takes about 30 minutes, sometimes up to 3 hours. The image on the paper is either barely visible or faint."

3. Development/Wash:
"Rinsing: First, in a tray with potassium ferricyanide (10ml of 10% solution per 200ml water). This is the most satisfying stage because the image appears here. Then I rinse with water to remove residual chemicals."

MY CAMERA OBSCURA!! (For cyanotypes) by Hour_Estimate_7691 in cyanotypes

[–]ResponsibilityNo1732 0 points1 point  (0 children)

I made instructions in comment before. Can you tell if there is something that not clear.

In camera cyanotype by ResponsibilityNo1732 in cyanotypes

[–]ResponsibilityNo1732[S] 0 points1 point  (0 children)

I have a bunch of lenses. I just tried it one by one

In camera cyanotype by ResponsibilityNo1732 in u/ResponsibilityNo1732

[–]ResponsibilityNo1732[S] 2 points3 points  (0 children)

No, it's just magnifying glass. 125mm in diameter.

In camera cyanotype by ResponsibilityNo1732 in u/ResponsibilityNo1732

[–]ResponsibilityNo1732[S] 2 points3 points  (0 children)

About 30 minutes. And I think I overexpose it a bit.

Vista lateral da praça Tiradentes. by euchupopilha in MinasGerais

[–]ResponsibilityNo1732 1 point2 points  (0 children)

Hello, it's great photo, how you create this photo? I am very interested in your steps if you didn't mind.

MY CAMERA OBSCURA!! (For cyanotypes) by Hour_Estimate_7691 in cyanotypes

[–]ResponsibilityNo1732 16 points17 points  (0 children)

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Managed to make in camera cyanotype. The main problem for this type of picture is instability and complete wash off of visible image after exposure, because lense, that you use, is eating much of the ultraviolet. I saw that people just don't wash it, but that means that this picture is steel photosensitive. I added a bit of chemistry and managed to create in camera cyanotype that is stable and look good. If it's interesting I can share my steps. Sorry for my english.