Tech tip1 min read
Methylene Blue Test for Residual Thiosulfate
The Methylene Blue test measures residual thiosulfate to confirm microfilm is properly washed and meets life expectancy standards.
The Methylene Blue test is a way to make sure a microfilm processor meets industry standards. It confirms that the film has been properly washed and meets Life Expectancy standards.
Highlights
- Insufficient washing or incorrectly mixed fixer leaves thiosulfate on the film
- Thiosulfate is accompanied by undeveloped silver halide, which can lead to silver print-up, redox formation and loss of information through micro blemishes
- Failure criterion under ANSI IT 9.17: residual thiosulfate above 1.4 µg/cm2 on processed clear film
- The Methylene Blue method in ISO 18917:1999 is a worldwide standard test for detecting residual hypo/fixer
Source:Eastman Park Micrographics(epminc.com)(opens in a new tab)
Frequently asked questions
What is the failure criterion for residual thiosulfate in the Methylene Blue test?
Under ANSI IT 9.17, residual thiosulfate above 1.4 µg/cm2 on processed clear film is a failure.
Which standard defines the Methylene Blue method for detecting residual hypo/fixer?
The Methylene Blue method in ISO 18917:1999 is a worldwide standard test for detecting residual hypo/fixer.
Why does thiosulfate remain on the film?
Insufficient washing or incorrectly mixed fixer leaves thiosulfate on the film.
What problems can residual thiosulfate cause?
Thiosulfate is accompanied by undeveloped silver halide, which can lead to silver print-up, redox formation and loss of information through micro blemishes.
What does the Methylene Blue test confirm?
It confirms that the film has been properly washed and meets Life Expectancy standards.
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