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Instructions for Obtaining
Residual Thisosulfate Certifications

The residual thiosulfate ion test using the Methylene Blue Test Method can detect concentrations of thiosulfate ion above 0.001 grams per square meter.  The Methylene Blue Test is required to certify Life Expectancy-500 year microfilm (previously referred to as "Archival" microfilm.) 

The Methylene Blue Test is performed in accordance with American National Standard ANSI/NAPM IT9.17 - 1993.  Because of the sensitivity of the test, the following procedures must be used: 

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Only processed, clear film can be tested. 

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A processing date must be included with each film sample.

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The film sample must arrive at the MSTC Laboratory within 10 calendar days after processing.  If the sample arrives late, it will be returned.  

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The film sample should contain no fingerprints, dirt, or other contaminants. 

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You must submit at least the following amounts of microfilm for the respective film types:

16mm film: One 12-inch strip or two 6-inch strips.
35mm film:  One 6-inch strip or three aperture cards.
105mm film:  One 105mm X 148mm microfiche.

 

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Please mark on the outside of the envelope, "MB Test".

You will receive written certification if the test is negative, but if the test shows greater than acceptable concentrations of residual thiosulfate ion, MSTC will contact you by telephone.  Please furnish the name of a contact person and telephone number.