Fig. 1

Generic stratigraphy for a simple early-period CN film, showing the black and white (B&W) emulsion (a), in this case subjected to a red tinting process, an adhesive subbing layer (b) and the CN base (c). More complex films can include additional and thin layers such as an overcoat and an anti-curling layer, each one ≤ 1 µm thick, located over the emulsion, and below the base respectively