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Mixture of pigment and photosensitizer on printing paper, plastic paper, Roughly spray. After drying, overlay the magnifying negative and use the UV exposure machine, Burn. Then wipe with tap water, sponge, etc. An image appears. It is dry and one step is completed. Repeat this process, replacing the pigment with C ・ M ・ Y ・ B. For this print, I used C, M, Y photosensitizers. 
#All these were made before 1992. It is not a commercially available photographic paper. Of course, it is not a computer graphic. It is completely analog handmade photographic paper.
