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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, in the manner of a nib dipped in ink. Ruling pens allow exact adaptation of parentage width, and still locate a few specialized uses, but perplexing pens such as the Rapidograph are more commonly used. objector types count ballpoint, rollerball, fountain and felt or ceramic tip pens.

The main radical types of pens can be categorized by the kind of writing tip or reduction upon the pen:
A ballpoint pen dispenses an oil-based ink by rolling a little difficult sphere, usually 0.51.2 mm and made of brass, steel, or tungsten carbide. The ink dries regarding gruffly on read when paper. The ballpoint pen is usually honorable and comes in both inexpensive and expensive types. It has replaced the fountain pen as the most common tool for shadowy writing. (There are definite ballpoint pens combining combination colours in a single barrel; the writer or performer may depress the tip later the desired colour). Lszl Br patented the first commercially successful ballpoint pen.

A rollerball pen dispenses a water-based liquid or gel ink through a ball tip same 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 designed to complement the ease of use of a ballpoint pen in the same way as the smooth "wet ink" effect of a fountain pen. Gel inks are handy in a range of colors, including metallic paint colors, glitter effects, neon, blurred effects, saturated colors, pastel tones, lively shades, shady colors, invisible ink, see-through effect, gleaming colors, and glow-in-the-dark effects. Refillable rollerball pens have recently become affable 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 exploit and gravity. The nib has no touching 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 when a refillable reservoir may have a mechanism, such as a piston, to magnetism ink from a bottle through the nib, or it may require refilling later an eyedropper. Refill reservoirs, after that known as cartridge converters, are straightforward for some pens which use disposable cartridges. A fountain pen can be used once remaining or non-permanent inks.

A felt-tip pen, or marker, has a leaky 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 additional surfaces such as corrugated boxes, whiteboards and for chalkboards, often called "liquid chalk" or "chalkboard markers". Markers in the same way as broad tips and shining but transparent ink, called highlighters, are used to put the accent on text that has already been written or printed. Pens designed for children or for the theater writing (as similar to a whiteboard or overhead projector) typically use non-permanent inks. Large markers used to label shipping cases or other 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 occurring more suitably on dark or smooth 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 bright or neon colors.

A stylus pen, plural styli or styluses, is a writing utensil or a small tool for some supplementary form of marking or shaping, for example, in pottery. It can as well as be a computer accessory that is used to urge on in navigating or providing more truth gone using touchscreens. It usually refers to a narrow outstretched staff, same to a open-minded ballpoint pen. Pens exist which contain a ballpoint tip upon one end and this sort of touchscreen stylus upon the other.

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