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14 LANTERN-SLIDE MAKING AND EXHIBITING. CHAPTER IV.—The Development of the Slide. The plate having been exposed, either Development. by contact or in the reducing camera, will then be ready for development, and as its treat- ment will be identical, the following instructions will apply in either case : — Use a deep 3£ x 3^ porcelain dish for developing, and always keep it clean and free from stains, with an occasional rub with a cloth dipped in dilute hydrochloric acid. Mix two ounces of the developer at the moment it is required, in a clean measure. Less solution can be used, but it is false economy. Place the exposed lantern plate in the dish, taking care not to touch the film, or finger marks will ap- pear. The lantern plate or slide should always be held by its opposite edges, and never between the thumb and fingers. Do not, as is sometimes advised, give the exposed slide a preliminary soaking in water; to do so generally produces bubbles, which ultimately appear as white spots on the screen. Tilt the dish slightly and pour on the developer slowly but without hesitation, at the same time bringing the dish level so that the developer flows across the plate in a continuous and even wave. If the plate is only partially or unevenly covered, it will show develop- ment marks when finished, so it is essential to learn how to perform the operation properly. It is really a very simple one. If the exposure has been correct^the image should appear- in about a min- ute. It should come up slowly, and the detail should appear gradually and evenly,