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What is a methylene blue test?

April 26, 2017BLUE methylene Test

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What is a methylene blue test?

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The methylene blue test (or residual thiosulfate test) is used to document film quality by measuring the chemical residue left on the film after processing. The test is in accordance with the American National Standards Institute PH4.8-1985 and ANSI IT9.1-1992. For more information, see State Archives Technical Publication #9, Producing High Quality Microfilm, pgs. 24 25, and #11, Introduction to Micrographics, pg. 15.