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@okayherewego

An example of duotone in cyanotype.

It's a bit of a cheat, as it's a double exposure.

First, I exposed eucalyptus leaves for maybe a week. This length of exposure gives the golden green colour.

No light got through the leaves, so under there was still unexposed.

Then I overlaid the whole image with vintage acetate star maps, to get a 'night sky' within the leaves.

A normal exposure kept it blue.