
Positive.
I made my first attempts at cyanotypes yesterday. Interesting process. Simple, really.
Reminded me of way back, during my mid-20s, when I worked as a draftsman for a civil engineering firm. I made a lot of blueprints in-office for field use. I’ll never forget the smell of ammonia.
Cyanotypes are pretty similar.
It takes mixing two chemicals – ferric ammonium citrate and potassium ferricyanide – and brushing the mixture on paper in subdued light.
The chemicals are non-toxic, but probably not good to ingest or inhale. Wearing gloves is a good idea.
Perfect? No. Cool? Yup. Fun? Definitely!
I made a cyanotype of this geometric pattern I created in Adobe Illustrator, which I printed out on a sheet of clear acetate.
I placed the acetate over the coated paper and sandwiched ’em both between a thin sheet of plexiglass and a backing board, holding everything together with clamps.
I set it out in the direct sun exposing the paper for about 8 minutes. I unclamped the printing frame, removed the paper, rinsing it under running water. I then dipped the paper into a tray that had a bit of hydrogen peroxide mixed in with water to help darken up the blue.
You can place any number of different things on top of the paper. Besides the graphic, I also used a small branch from a plant. I plan on using photographic negatives from my medium and large format cameras in the near future.
Perfect? No. Cool? Yup. Fun? Definitely!
There are bunches of tutorials on YouTube. Bunches.