ASTM E 1135 - 97. Standard Test Method for Comparing the Brightness of Fluorescent Penetrants

American Society for Testing and Materials (ASTM). 1997, 5 pages.
This test method describes the techniques for comparing the brightness of the penetrants used in the fluorescent dye penetrant process. This comparison is performed under controlled conditions which eliminate most of the variables present in actual penetrant examination. Thus, the brightness factor is isolated and is measured independently of the other factors which affect the performance of a penetrant system.