how about brown!
It's getting to be an obsession! Actually someone I trust, love and admire -a true mentor to me- once speaking on the subject of obsession she pointed out to me! Then she said that I have the right/necessary amount to produce the kind, amount, type, quality(?) of work I do, not the amount requiring medical intervention...!
I am not exactly sure of the role of obsession in my case, but if getting deeper and deeper into a process, wanting to learn more and more, experimenting non stop while watching the weather predictions and praying for sun shine have anything to do with that.... well then yes! I am totally obsessed with cyanotype, or at least with trying tiny insecure child steps into the process and some of its variations...
Here are some samples of the prussian blue becoming yellow, brown and OMG the very dramatic chocolate black which I LOVE!!!