Brian Shaw and I have been discussing cyanotype on concrete in the thread about cyanotype longevity.

It seemed a good idea to break off and start a new thread about concrete. So here it is.

My next step will probably be to get Mike Ware's material to better understand the ferric chemistry.

But right now I'm in a parking lot posting from my phone and need to get back on the road.

Anyone with any experience please chime in.