Anthotype

Phenomenal. I am very curious to find out how you extract the juices, and how long the exposure might be. Much nicer blue than the cyanotype in my opinion. Can you use all different color irises?
Thank you for posting this! How little I know.
- Thomas

Iris petals are very nice for this. No added water needed for them, just mush up/grind in a mortar & pestle. Put the resulting juices and pulp in a paper coffee filter and squeeze out the juices then use a brush to paint it on your chosen paper. Dry inside in shade.

It's a nice shade of blue/purple but it was a very high contrast negative and the resolution isn't very nice, unfortunately.
This one took about 2-3 days of sunshine. I didn't find the colour changed anymore after 3 days, though I kept hoping and leaving it outside for a few more days after that.

You can use this method with all types of fruit/vegetables/flowers. Some are more lightfast than others. I tried some purple sage and found no colour change after on-off leaving outside for a few days. Not too much of a loss since purple sage results in an weak tea colour.

I'll probably try red cabbage next since I have some in my fridge and I've heard that's suppose to be fairly good for this process.