Correct developing of the exposed film cannot be overemphasised. Manual processing requires that you maintain active solutions by replenishing regularly, using the proper equipment, and following a standard procedure systematically.
A timer and thermometer are essential to manual processing. Continually monitor the developer solution temperature to ensure proper chemical activity. Once the temperature has been determined, an accurate timer is needed to process the film for the proper length of time. Ask us for a free developing time/temperature chart to determine the appropriate chemical temperature and processing the type of film you are using.