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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 permit correct adjustment of extraction width, and still find a few specialized uses, but technical pens such as the Rapidograph are more commonly used. highly developed types affix ballpoint, rollerball, fountain and felt or ceramic tip pens.

The main militant types of pens can be categorized by the nice of writing tip or point on the pen:
A ballpoint pen dispenses an oil-based ink by rolling a small hard sphere, usually 0.51.2 mm and made of brass, steel, or tungsten carbide. The ink dries roughly snappishly upon entry similar to paper. The ballpoint pen is usually reliable and comes in both within your means and costly types. It has replaced the fountain pen as the most common tool for shadowy writing. (There are definite ballpoint pens combining compound colours in a single barrel; the writer or player may depress the tip with the desired colour). Lszl Br patented the first commercially well-to-do ballpoint pen.

A rollerball pen dispenses a water-based liquid or gel ink through a ball tip similar 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 meant to attach the ease of understanding of a ballpoint pen with the mild "wet ink" effect of a fountain pen. Gel inks are easy to use in a range of colors, including metallic paint colors, glitter effects, neon, blurred effects, saturated colors, pastel tones, busy shades, shady colors, invisible ink, see-through effect, shining colors, and glow-in-the-dark effects. Refillable rollerball pens have recently become straightforward 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, next through the nib, due to capillary law and gravity. The nib has no distressing parts and delivers ink through a skinny slit to the writing surface. A fountain pen reservoir can be refillable or disposable; the disposable type is called an ink cartridge. A pen later than a refillable reservoir may have a mechanism, such as a piston, to charisma ink from a bottle through the nib, or it may require refilling later than an eyedropper. Refill reservoirs, as a consequence known as cartridge converters, are easily reached for some pens which use disposable cartridges. A fountain pen can be used afterward remaining or non-permanent inks.

A felt-tip pen, or marker, has a porous tip of fibrous material. The smallest, finest-tipped felt-tip pens are used for writing upon paper. Medium-tipped felt-tips are often used by children 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 subsequently broad tips and gleaming but transparent ink, called highlighters, are used to play up text that has already been written or printed. Pens meant for children or for the theater writing (as later than a whiteboard or overhead projector) typically use non-permanent inks. Large markers used to label shipping cases or supplementary packages are usually surviving 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 up more helpfully upon 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 arrive in gleaming or neon colors.

A stylus pen, plural styli or styluses, is a writing utensil or a little tool for some other form of marking or shaping, for example, in pottery. It can afterward be a computer accessory that is used to put up to in navigating or providing more correctness considering using touchscreens. It usually refers to a narrow elongated staff, thesame to a advocate 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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