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The line width depends on various factors like the type of ink and pressure applied. Some standard ball diameters are: 0.3 mm, 0.38 mm, 0.4 mm, 0.5 mm, 0.7 mm (fine), 0.8 mm, 1.0 mm (medium), 1.2 mm and 1.4 mm (broad). Pens with ball diameters as small as 0.18 mm have been made by Japanese companies, but are extremely rare.
Gel pens. Compared to other inks, gel ink has higher melting point viscosity, which supports a higher proportion of pigments in the medium.The pigments are typically copper phthalocyanine, carbon black and iron oxides, and the gel is made up of water and biopolymers, such as xanthan gum and tragacanth gum, as well as some types of polyacrylate thickeners.
Aside from standard ball-point sizes of fine or medium, the points of some pens are manufactured at multiple point-sizes—some in series with point-sizes ranging from 0.5 to 1.6mm—allowing for broader applications. [37] Effects not generally associated with ballpoint pens can be achieved. [36]
Speedball makes nibs for dip pens in a variety of sizes. There are also a series of left handed nibs, designated LC, available in the same sizes as the C-0 through C-4. In the 1940s Speedball introduced the 'Flicker' Series of pens in the B style designated FB, named for the brass reservoir that flicks open for easy cleaning.
Close up of an extra fine roller ball pen next to something written with it. There are two main types of roller ball pens: liquid-ink pens and gel-ink pens.The "liquid-ink" type uses an ink and ink-supply system similar to a fountain pen, and they are designed to combine the convenience of a ballpoint pen with the smooth "wet ink" effect of a fountain pen.
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