Quote Originally Posted by philldresser

Thanks for the reply. I was refering to the Cyanotype exposure (UV light) which is a contact print process, so no aperture available. I just wondered if the chemicals responded reciprocally like the Silver processes do, and whether there is a heel /shoulder as well.

Attached is an image file showing a cyanotype compared to a palladium curve. This curve should give you some idea of what to expect in printing cyanotype, especially as that regards the toe and the shoulder of the curve.