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A pen is a common writing instrument used to apply ink to a surface, usually paper, for writing or drawing. Historically, reed pens, quill pens, and dip pens were used, with a nib dipped in ink. Ruling pens allow perfect adjustment of lineage width, and nevertheless find a few specialized uses, but highbrow pens such as the Rapidograph are more commonly used. avant-garde types count up ballpoint, rollerball, fountain and felt or ceramic tip pens.

The main campaigner types of pens can be categorized by the nice of writing tip or tapering off upon the pen:
A ballpoint pen dispenses an oil-based ink by rolling a small difficult sphere, usually 0.51.2 mm and made of brass, steel, or tungsten carbide. The ink dries on the subject of suddenly on gate as soon as paper. The ballpoint pen is usually obedient and comes in both within your means and expensive types. It has replaced the fountain pen as the most common tool for indistinctive writing. (There are distinct ballpoint pens combining multiple colours in a single barrel; the writer or artiste may depress the tip past the desired colour). Lszl Br patented the first commercially wealthy ballpoint pen.

A rollerball pen dispenses a water-based liquid or gel ink through a ball tip thesame to that of a ballpoint pen. The less-viscous ink is more easily absorbed by paper than oil-based ink, and the pen moves more easily across a writing surface. The rollerball pen was initially expected to append the ease of access of a ballpoint pen taking into account the smooth "wet ink" effect of a fountain pen. Gel inks are easy to get to in a range of colors, including metallic paint colors, glitter effects, neon, blurred effects, saturated colors, pastel tones, active shades, shady colors, invisible ink, see-through effect, shiny colors, and glow-in-the-dark effects. Refillable rollerball pens have recently become approachable using cartridges of fountain pen ink.

A fountain pen uses water-based liquid ink delivered through a nib. The ink flows from a reservoir through a "feed" to the nib, after that through the nib, due to capillary work and gravity. The nib has no moving parts and delivers ink through a thin slit to the writing surface. A fountain pen reservoir can be refillable or disposable; the disposable type is called an ink cartridge. A pen subsequent to a refillable reservoir may have a mechanism, such as a piston, to charm ink from a bottle through the nib, or it may require refilling when an eyedropper. Refill reservoirs, also known as cartridge converters, are clear for some pens which use disposable cartridges. A fountain pen can be used gone surviving or non-permanent inks.

A felt-tip pen, or marker, has a spongy tip of fibrous material. The smallest, finest-tipped felt-tip pens are used for writing on paper. Medium-tipped felt-tips are often used by kids for coloring and drawing. Larger types, often called "markers", are used for writing in larger sizes, often upon new surfaces such as corrugated boxes, whiteboards and for chalkboards, often called "liquid chalk" or "chalkboard markers". Markers afterward broad tips and bright but transparent ink, called highlighters, are used to make more noticeable text that has already been written or printed. Pens designed for children or for the theater writing (as like a whiteboard or overhead projector) typically use non-permanent inks. Large markers used to label shipping cases or new packages are usually permanent markers.

A gel pen uses ink in which pigment is suspended in a water-based gel. Because the ink is thick and opaque, it shows taking place more clearly on dark or sleek surfaces than the typical inks used in ballpoint or felt tip pens. Gel pens can be used for many types of writing and illustration. Gel pens often come in shiny or neon colors.

A stylus pen, plural styli or styluses, is a writing utensil or a little tool for some supplementary form of marking or shaping, for example, in pottery. It can as well as be a computer complement that is used to support in navigating or providing more truth later than using touchscreens. It usually refers to a narrow extended staff, similar to a futuristic ballpoint pen. Pens exist which contain a ballpoint tip upon one end and this sort of touchscreen stylus on the other.

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