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Frida Kahlo Fotosammlung in Marta Herford Museum

http://marta-herford.de/index.php/frida-kahlo-2/

MARTa Herford: Frida Kahlo Museum für zeitgenössische Kunst | Design | Architektur

https://albumenworks.wordpress.com/2013/07/10/negative-deterioration-part-one-digitization-and-preservation-of-cellulose-nitrate-and-cellulose-acetate-negatives/

Negative Deterioration Part One: Digitization and Preservation of Cellulose Nitrate and... Before polyester film became readily available in the 1950's, all flexible film negatives were made on some form of cellulose nitrate or cellulose acetate support. Both of these film bases have de...