Well, here is an update on the large-scale cyanotype photograms I have been working on recently. I have made a basic contact frame out of 15mm ply painted black and with four rubber grip feet on the underside. The board and 6mm safety glass are 24"x32". Picture below is the first exposure made today using my new frame (I previously used a large cheap clip-frame but this was just not up to the job. Exposure as it stands is eight hours and fifty minutes in bright sunshine! I think it will need another day...