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At room temperatures, few spots appeared unless the film was permitted to humidify for a week, whereas at tropical temperatures the spots were found in large numbers on film left two days in the humidor. When the effect of sudden changes of temperature conditions was studied, very few spots were produced unless the film was subjected to at least eight hours humidification previous to the change to frigid conditions. In every case the markings were more numerous on film which was flashed before the moisture treatment. When the film was refrigerated previous to humidification, the time of refrigeration had little apparent influence on the size and extent of the markings.
9. Mottled Spots. On film which had been subjected to sudden temperature changes, irregular mottled spots were found which were of slightly lighter density inside and slightly heavier density outside than the surrounding film. The marking is vague in outline and hazy in appearance. It was occasionally found with a dark gray spot in the center. In general, mottled spots occurred more frequently on film which had been refrigerated previous to humidification. The order of exposing appears to have little influence on the extent of the markings.
10. Serrated Edged Spots. When film is subjected to abnormal humidity conditions so that the condensed moisture is sufficient to render the gelatine mobile, certain specific markings are produced on refrigeration. The most common spot has sharply defined edges deeply serrated with a slightly lighter density just inside the serrations, while the center of the spot has a density similar to the remainder of the film. When conditions are reversed; that is, refrigeration preliminary to humidification, especially if the refrigeration is short compared with the time in the humidor, these spots are likewise formed. A few examples were noted on film treated at tropical temperatures, which was exposed after the moisture treatment. The order of exposing the film had only a slight effect on the tendency for the spots to occur.
Miscellaneous Markings. A few scattered examples of spots similar to Nos. 2 and 3 were noted. These were found chiefly on film which had been exposed and humidified at 110° F. for 48 hours and then refrigerated 24 hours, and in another case where the film had been refrigerated 48 hours and then humidified at 110° F. for one week. In one case where the film had been humidified at 110° F. for 24 hours and subsequently refrigerated 24 hours there were a great many markings like No. 4. Generally speaking there were very few examples of markings like those found where actual water comes in contact with the film as mentioned under A. (page 29) with the exception of the white spot (No. 1) which is the most common moisture spot observed on motion picture emulsions.
C. Markings Caused by Abnormal Drying Conditions
Although drying marks are always produced on the emulsion side of film, their formation may be the result of either one or both
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