English Translation

2-304a 9. Final watering: After fixation about 1⁄2 hour must be watered with running water to remove the rests of the fixation salt from the gelatine layer of the plate or film. In hot days bacterial food risk! Add a few drops of carbolic acid. 10. Drying of the negatives: Negatives can be dried in the air. If it is to be done very quickly, there is a lot of alk o- holger o cknun g on plates. The negative is inserted in absolute alcohol for a short time. Films carry this treatment ni c h t, because the celluloid dissolves in alcohol. Drying in the drying cabinet at approx. 30 degrees C and simultaneous ventilation is more advantageous. In the event of an emergency, any hair dryer (dryer) can be used for drying, but care must be taken to ensure that the layer does not start to melt due to excessive heat development and that the negative is not polluted by swirling dust particles. For this reason, drying small film negatives is not particularly advisable. Also a wet negative must not be dried directly in the sun, as there is a risk of wrinkle grain formation. Before drying, the small film negatives must be cleaned with a soft deer leather or the Agfa viscose sponge on the back, so that no drying spots (edges) arise. 11. Attenuation and strengthening: Overexposed plates and films can be improved by bathing in the farmer's attenuator: A. 100 ccm of water, 50 g of fixing salt, B. 100 cm of water in which 10 g of red blood leach salt is dissolved. For use 3 parts A., 1-3 parts of solution B. In the case of small film negatives, success is uncertain. Increased: underexposed, but normal negatives with good gradation. however, only very thin, can be made more copyable with ready-to-use chrome amplifiers, copper amplifiers or mercury amplifiers (V o rs ic h t, strong poison!!). Note the exact usage regulations. For small film negatives, reinforcement is only of very little success due to the formation of a disproportionately coarse grain. Table II. 12. The different negatives according to graduation and coverage. Gradation Degree of coverage thin normal densely hard only lights, blackening under-heavy transparent everything else is missing different slightly negative, (highly underexposed only the lights still or strongly underexhibited (low overexposed) wrapped) kopable (very overexamined) normal low coverage, negative corresponds to the otherwise good object (too short developed) (normal exposure and development) soft light differences somewhat reduced (short developed) flue very low contrasts veil by light whole negative heavy (high underexamines or development, or too short transparent, old plates or contrasts low-wrapped) films (strong overextension or overdevelopment) V. The positive process - copying and magnifying, The photographic negative shows the shadows bright and the lights dark. In order to get corresponding "positive" images according to nature, the conditions must be reversed, i.e. dark shadows and bright lights. This is done by copying or magnifying light-sensitive black silver, chlorine brom silver or chlorine silver papers or plates (diapositives). 9