NASA NTRS · 19830000580
Dye Indicators for Acidic or Basic Surface Contamination
Abstract
Application of pH-sensitive dye solution serves as test for acidic or basic contamination of critical bonding surface. Aqueous solution of 0.1 percent Direct Red No. 28 capable of indicating acid activating solution down to 10 parts per million on hardware and tooling. Dye did not cause detectable contamination of surface.
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Lakin, A., Schuler, F.. 1984-11-01. Dye Indicators for Acidic or Basic Surface Contamination. https://ntrs.nasa.gov/citations/19830000580
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