Defender Photo Supply
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Defender Photo Supply was an early leader in manufacturing of black & white sheet film, plates, printing paper, and instructional books. Incorporated in 1899 in Rochester, New York, it was purchased by DuPont in 1945.
- Defendol - an affordable developing agent created to sidestep developers controlled by German patents
- Chromatone Process - Introduced in 1935, is a method of using a collodion stripping paper manufactured by the Defender Company and tricolor toners developed by Francis H. Snyder and Henry W. Rimbach of New York City.
- VC Paper
- Walker, P. "Du Pont." The Focal encyclopedia of photography, 3rd ed. (1993), p. 231.
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