. The Dental cosmos. r covering should be placed over themeasuring pastil (Fig. 8). The exami-nation or comparison must be made byartificial light—preferably a 16-candle-power incandescent electric light. Ablack background must be utilized. Theexamination should not be too long, aseven artificial light will slowly restorethe color. The incidence of light shouldalways be the same—in other words,the comparison of colors should be madealways under the same making the exposure, the pastilmust be examined at once, as dry at-mosphere will restore the color, whileheat (above 100° F.)

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. The Dental cosmos. r covering should be placed over themeasuring pastil (Fig. 8). The exami-nation or comparison must be made byartificial light—preferably a 16-candle-power incandescent electric light. Ablack background must be utilized. Theexamination should not be too long, aseven artificial light will slowly restorethe color. The incidence of light shouldalways be the same—in other words,the comparison of colors should be madealways under the same making the exposure, the pastilmust be examined at once, as dry at-mosphere will restore the color, whileheat (above 100° F.) is likely to increaseit. The measuring pastil and the indexpastil must be an exact match at unused pastils should be kept in ahumidor that has sufficient ventilationto prevent mildewing. Used pastils maybe restored almost to normal and util- MAC KKK.—MAKLV6 DENTAL RADIOGRAPHS. 41 ized the second time, but it is not wise practical points—the only ones that haveto do so. given us any concern. Fig. m feat*

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