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The Martin scale is an older version of color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual. It was created by the anthropologist Rudolf Martin in the first half of the 20th century.
(Section 5.1.4, 5.2). Manual or automatic actuators shall be easy to locate and readily accessible to the user (Section 5.2). Water temperature of Eye or Eye/Face wash station should be within 60–100 °F (16–38 °C). Eye or Eye/Face wash stations should have highly visible and well lit signage.
Although not required, it is recommended that all eyewear meet ANSI Z87.1, but for ballistic protective eyewear it is required that it meets military standards for impact protection (MIL-DTL-43511D clause 3.5.10 for goggles and visors and MIL-PRF31013 clause 3.5.1.1 for spectacles).
The scale consists of 20 colors [1] (from light blue to dark brown-black) that correspond to the different eye colors observed in nature due to the amount of melanin in the iris (in this case, the lower the number, the lighter the eye color): [2] [3]
[1] The standard was published in October 2003, splitting off from ISO 3864:1984 , which set out design standards and colors of safety signage and merging ISO 6309:1987, Fire protection - Safety signs to create a unique and distinct standard for safety symbols.
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ANSI Z35.1 the Specifications for Accident Prevention Signs, [c] was an American standard that dictated the layout, colors and wording of safety signs in the United States. The standard is the first American standard that made specific demands for the design, construction, and placement of safety signage in industrial environments.
Glass chart. A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.