Quote Originally Posted by gandolfi View Post
reviving this oldish thread.

My girlfriend has just made her first tonings of cyanotypes, made with a "tea" of oak tree bark - and it works really well! No need to go buy that tanning acid!

Fun, and easy to do. And it works quick too...

I wonder how walnut or willow would do... off to experiment!
Very interesting, Emil. Just by coincidence, last time I stopped at the vintners' supply shop, they didn't have any tannic acid, but they gave me a teabag of oak.
I'll have to try it out.