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Like magnetism, the daguerreotype process can be demonstrated but is not fully understood and seems as much black magic and alchemy as it does chemistry and physics. Consider iodine. These strange, blackish crystals emit a purple gas that acts upon silver to create silver iodide, a light sensitive-substance. This purple fume is a veritable genie in a bottle—a prankster Puck—that once unleashed ushers in both good and ill. |
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