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inks and x-rays

Does anyone happen to know the answer to the following P2 chronology questions?

1. When did soy-based inks begin to replace solvent-based inks?
2. When did x-ray technicians begin to use machines to develop x-rays rather
than using chemical developers?

Also, if anyone knows approximately how much ink is solvent-based and how much
is soy-based I'd welcome that information.

Thank you very much,

Karen Sundheim (GCI)
P2 Librarian
US EPA Region 9 Library
San Francisco, California
Tel: 415-744-1508