![]() Soften to facilitate penetration of the developing chemicals.Dvpin agents Combine with atm oxygen Efficient regenrn of phenidone by hdroquinoneGelatin normally swells In water.more pronounced in alkali dvping solution.Low ph : dvpin axn sluggish…hig ph –dvpr overactive and uncontrolled n chemical foggingRestrainer inc the negative charge barrier around silver halide.Phenidone:quick but develops all exposed agX,HQ is selective but less quickHigh selectivity to act on latent image centre n thus produce low chemical fog.ĺdequate activity even in low conc.Superadditivity is that,in presence of HQ effectiveness of PQ is increased by reducing t oxidized PQ n regenerating it.reducing effect of combn is more than sum of effects produced individually.Csette hatch: easy transport of films b/w radiograph room and darkroomHopper: unexposed films kept for immediate use in reloading casettesLoading bench: ample working space and generous cupboard space.When white light pass through, ceratin colors are absorbed by the filter while those corresponding to the the color of the filter will be transmitted.Choose a filter for which the film is relatively unresponsive and stopping lights to which the film is most sensitive.Involves a metal cylinder wre we step in and manually rotate to gain entry to the darkroomAdv: doesnot require a large area for installation.2 parallel passages with a facing wall.Adv: easy ans instant access all times Disadv: requires more area.Inexpensive and economical, link electronically the door locking mechanism with lighting circuitthus preventing the door from being openend wen the safe lights are on. ![]() No windows and only air conditioning and exhaust only if feasible.
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