It also contaminates the developing solution.Ĭ. Then, when new films are placed on the hanger and immersed in the developing solution, the dried fixing solution runs down onto the films and causes streaked or spotted radiographs. If a hanger is not washed properly, the fixing solution dries on it. Film hangers require particular attention after films have been removed from them. Wash the thermometers and film holders thoroughly before transferring them to either the developing or fixing solutions. Spilled chemicals that are not wiped up will evaporate and leave a precipitated concentrate that contaminates films. If chemicals are spilled, wipe up the spill immediately and wash the area with clear water. The dental specialist must not spill chemicals. Clean all equipment and only use equipment for their intended purposes. Because of the extreme sensitivity of x-ray films, rigid cleanliness must be observed when processing films. This can be done by forcibly changing the air with a ventilator fan.ī. The water pipes should lead to a mixing valve so the temperature of the flow can be regulated. The room should be supplied with both hot and cold water.

The ceiling may be painted white so that enough illumination will be reflected when the correct type of safelight is used. The walls of the darkroom and the maze should be painted black to absorb light. If the darkroom has a door, it should have an inside lock so that no one can accidentally enter while films are being processed. An entrance built in the form of a maze to keep out light is better than a door. The room need not be large, but it must be constructed so that no light can enter through cracks or crevices. Since x-ray films are more sensitive to light than most photographic films, it is important to have a good darkroom.

Darkroom developing