Vol. 8, No. 2 • April 2009Q. Please explain the minimum color perception requirement considered acceptable to ASNT for the purpose of MT. I have read requirements for PT but cannot find them for MT. V.M., Houston, TX. A. Paragraph 8.2.2 of SNT-TC-1A (2006) states: Color Contrast Differentiation: The examination should demonstrate the capability of distinguishing and differentiating contrast among colors or shades of gray used in the method as determined by the employer. This should be conducted upon initial certification and at three-year intervals thereafter.
It can only be determined by the certifying company what exam(s) are necessary. For example, a company that only uses red colored dry powder may be justified in a red against white background verification. At another company, several colors of dry powder in addition to fluorescent materials may be used. You can see the same “minimum” exam for both companies would be different.
A quick look through Interpreting SNT-TC-1A offers several inquiries that relate to your situation. These include Inquiries 78-11, 01-06, 81-15 and 83-6. Interpreting SNT-TC-1A is free to ASNT members at Members Only.
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