Abstract
Abstract It has been shown that the reducing power of the water-soluble substances extracted from raw rubber is destroyed by the action of sunlight and ultra-violet light on raw rubber. This effect of light may be seen in a very striking way by treatment with an ammoniacal solution of silver nitrate of partially irradiated rubber sheets, which in a certain sense represents a “development.” In contrast to raw rubber, the most highly purified Tjipetir-gutta-percha, which contains no protective substances sensitive to light, forms peroxides with natural or artificial irradiation. These peroxides in turn reduce ammoniacal silver nitrate solution, so that irradiated samples of crepe rubber and Tjipetir-gutta-percha when developed with the reagent mentioned give pictures which behave negatively and positively. Finally the behavior toward ultra-violet light of a few artificial protective agents was investigated. Further experiments will be devoted to the problem of vulcanized rubber under the same conditions.
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