Washout film should be dried vertically to avoid standing water, or in a cabinet-style dryer with circulating warm air. Flat-drying on a table will work, but is not normally recommended. Flat drying will take significantly longer, and increases the potential for film damage from standing water.
The film should be allowed to dry until it is one solid color (no “tiger striping”). A second indication is ease of carrier removal.
-Michael Sullivan, IKONICS Imaging
