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Astronomical applications and characteristics of a low-gamma Phenidone (POTA) developer are investigated. Ila-D plates exposed on an astrosensitometer, developed in POTA, show retention of density information over an extreme brightness range and no change in minimum detectable intensity when compared with plates developed in D-76 and D-19. The successful application of POTA developer to scintillation-tube photographs and possible future uses are also discussed. For certain applications indoi:10.1086/128407 fatcat:ad23wp5ltfd5zdqshkyykzv724