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  2. High-visibility clothing - Wikipedia

    en.wikipedia.org/wiki/High-visibility_clothing

    High-visibility clothing, sometimes shortened to hi vis or hi viz, is any clothing worn that is highly luminescent in its natural matt property or a color that is easily discernible from any background. It is most commonly worn on the torso and arm area of the body.

  3. Multi-spectral camouflage - Wikipedia

    en.wikipedia.org/wiki/Multi-spectral_camouflage

    Multi-spectral camouflage is the use of counter-surveillance techniques to conceal objects from detection across several parts of the electromagnetic spectrum at the same time. While traditional military camouflage attempts to hide an object in the visible spectrum , multi-spectral camouflage also tries to simultaneously hide objects from ...

  4. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    The visible spectrum is defined as that visible to humans, but the variance between species is large. Not only can cone opsins be spectrally shifted to alter the visible range, but vertebrates with 4 cones (tetrachromatic) or 2 cones (dichromatic) relative to humans' 3 (trichromatic) will also tend to have a wider or narrower visible spectrum ...

  5. Optical brightener - Wikipedia

    en.wikipedia.org/wiki/Optical_brightener

    Laundry detergent fluorescing under ultraviolet light. Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm) through the ...

  6. Sun protective clothing - Wikipedia

    en.wikipedia.org/wiki/Sun_protective_clothing

    ASTM D 6603 is a consumer format recommended for visible hangtag and care labeling of sun protective clothing and textiles. A manufacturer may publish a test result to a maximum of UPF 50+. Sun protective clothing and textile/fabric manufacturers are currently a self-regulating industry in North America, prescribed by the AATCC and ASTM methods ...

  7. White - Wikipedia

    en.wikipedia.org/wiki/White

    These are chemical compounds that absorb light in the ultraviolet and violet region (usually 340–370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420–470 nm). OBAs are often used in paper and clothing to create an impression of very bright white.

  8. Blue - Wikipedia

    en.wikipedia.org/wiki/Blue

    Blue is the colour of light between violet and cyan on the visible spectrum. Hues of blue include indigo and ultramarine , closer to violet; pure blue, without any mixture of other colours; Azure, which is a lighter shade of blue, similar to the colour of the sky; Cyan, which is midway in the spectrum between blue and green , and the other blue ...

  9. Vantablack - Wikipedia

    en.wikipedia.org/wiki/Vantablack

    Vantablack is a class of super-black coatings with total hemispherical reflectances (THR) below 1% [4] in the visible spectrum. The name is a portmanteau of the acronym VANTA ( vertically aligned nanotube arrays ) [ 5 ] and black .