7. Reagents and Materials
7.1 Chromic Acid Cleaning Solution, or a nonchromiumcontaining,
strongly oxidizing acid cleaning solution.
(Warning—Chromic acid is a health hazard. It is toxic, a
recognized carcinogen, highly corrosive, and potentially hazardous
in contact with organic materials. If used, wear a full
face-shield and full-length protective clothing including suitable
gloves. Avoid breathing vapor. Dispose of used chromic
acid carefully as it remains hazardous. Nonchromiumcontaining,
strongly oxidizing acid cleaning solutions are also
highly corrosive and potentially hazardous in contact with