The chemistry of light and photography

The chemistry of light and photography

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by Hermann Wilhelm Vogel
     
 

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This is an OCR edition with typos.
Excerpt from book:
CHAPTER VE. LIGHT AS A CHEMICALLY-OPERATIVE AGENT. Theory of Photography—Nature of Light—Undnlatory Theory—Semi. Tones—Mouldering away of Bed Sulphuret of
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