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  2. Non-photo blue - Wikipedia

    en.wikipedia.org/wiki/Non-photo_blue

    (1) Colour copy of non-photo blue pencil. (2) Colour copy of blue pen. (3) Grayscale copy of non-photo blue pencil. (4) Grayscale copy of blue pen. Non-photo blue (or non-repro blue) is a common tool in the graphic design and print industry, [1] [2] being a particular shade of blue that cannot be detected by graphic arts camera film. This ...

  3. Invisible ink - Wikipedia

    en.wikipedia.org/wiki/Invisible_ink

    Invisible ink can be applied to a writing surface with a specialty purpose stylus, stamp, fountain pen, toothpick, calligraphy pen, Cotton swab, or even a finger dipped in the liquid. Once dry, the written surface looks as if it were blank, with a similar texture and reflectivity as the surrounding surface.

  4. Cephalopod ink - Wikipedia

    en.wikipedia.org/wiki/Cephalopod_ink

    Cephalopod ink has, as its name suggests, been used in the past as ink for pens and quills; the Greek name for cuttlefish, and the taxonomic name of a cuttlefish genus, Sepia, is associated with the brown colour of cuttlefish ink (for more information, see sepia). Squid ink pasta with truffles and pistachios

  5. Optical mark recognition - Wikipedia

    en.wikipedia.org/wiki/Optical_mark_recognition

    As some phototubes are mostly sensitive to the blue end of the visible spectrum, [12] blue pens could not be used, as blue inks reflect and transmit blue light. Because of this, number two pencils had to be used to fill in the bubbles—graphite is a very opaque substance which absorbs or reflects most of the light which hits it. [11]

  6. "Better than Crest Whitestrips" — This teeth whitening pen is ...

    www.aol.com/lifestyle/better-than-crest-white...

    Teeth whitening products can sometimes be a hit or miss, but there's a lot to love about the MySmile Teeth Whitening Pen, which pledges to get rid of stains from smoking, coffee, and wine. Besides ...

  7. Blue - Wikipedia

    en.wikipedia.org/wiki/Blue

    Various shades of 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 ...

  8. Permanent marker - Wikipedia

    en.wikipedia.org/wiki/Permanent_marker

    In general, permanent marker ink comprises a main carrier solvent, a glyceride, a pyrrolidone, a resin, and a colorant, [1] making it water resistant.It is capable of writing on a variety of surfaces from paper to metal to stone.

  9. AOL Mail

    mail.aol.com/?icid=aol.com-nav

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

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