solutions the photographic element is exposed to active radiation sufficient to cause photobleaching of the contrast enhancement layer and exposure of the photoresist layer the photographic element is exposed to actinic radiation sufficient to cause photobleaching of the contrast enhancement layer and exposure of the photoresist layer the photographic element is developed in an aqueous photoresist developer whereby the contrast enhancement layer is stripped from the photoresist layer by the developer application_number US 74036985 A description the contrast enhancement layer cel of the present invention includes compounds having the following characteristics a photosensitive compound that generates an acidic photoproduct on exposure to actinic radiation an indicator dye that changes color in the presence of acid and at least one polymeric binder that is soluble in either water or weakly alkaline aqueous solutions ph about 7 or higher the photosensitive compound used in the cel should be sensitive to radiation at wavelengths of 300 to 450 nm the desired concentration of acidic photo products produced on exposure to radiation is a function of the sensitivity of the indicator dye to ph change generally it is desirable that the photosensitive compound produce as large a decrease in ph of the layer as possible so that the indicator changes color fast examples of the preferred photosensitive compounds that generate acidic photoproducts include naphthoquinone 1 2 diazide 2 5 sodium sulfonate and naphthoquinone 1 2 diazide 2 4 sodium.