I don't measure x drops per sheet for cyanotypes. (I do for platinum - can't afford to waste any of those chemicals!) I measure the A&B solutions into a yogurt tub, dip my brush in and coat. I usually double coat, as it gives deeper shadows. I was doing 4 4x5's, double coated, with 6 ml of solution. Different papers have different absorbency, so you'll have to tweak for your paper and brush technique.
It doesn't take very long to dry - half-hourish, though the humidity, fans, heaters, etc will make it vary. Don't use a hot hair dryer to speed things up. If it looks dry, but I'm not sure, I touch my forearm gently to the paper. (I'm usually wearing nitrile gloves all day, so my fingers don't turn blue!)
Last edited by sly; 12-08-2012 at 02:46 PM. Click to view previous post history.