A highlighter is a type of writing device used to draw attention to sections of text by marking them with a vivid, translucent colour. A Highlighter is a writing or drawing instrument which contains as its core a lead composed of polyester fiber or other fibrous material, which is soaked evenly by filling it with ink. The felt-tip pen is originally from Japan.

Many highlighters come in bright, often fluorescent colours. Being fluorescent, highlighter ink glows under black light. The most common colour for highlighters is yellow, but they are also found in orange, red, pink, purple, blue, and green varieties. Some yellow highlighters may look greenish in colour to the naked eye. Yellow is the preferred color to use when making a photocopy as it will not produce a shadow on the copy. Yet, the use of different colour highlighters simultaneously can systematically make information even more organized and readable and in high contrast. This also depends on the reading function and density setting of the copying machine.

The mine is surrounded by a mostly colored shell, held in the filling color, which is equipped with a cap to protect against dehydration.

At the end, a differently shaped writing, drawing or painting tip transports the writing fluid from the core to the surface to be described or painted. This lace used to be made of felt. Today, mostly plastic tips are used with defined capillaries. Felt-tip pens are in principle refillable.

Solvent-based felt-tip pens are particularly affected by the problem of dehydration during transport to the consumer. As a solution, first felt pens were developed with unimpaired tips. Prior to the first use of such pens, the consumer had to pierce an internal membrane by a strong pressure on the stable tip to allow the ink to soak the tip.

Highlighters are available in multiple forms, including some that have a retractable felt tip or an eraser on the end opposite the felt. Other types of highlighters include the trilighter, a triangularly-shaped pen with a different-coloured tip at each corner, and ones that are stackable. There are also some forms of highlighters that have a wax-like quality similar to an oil pastel.

“Dry highlighters” (occasionally called “dry line highlighters”) have an applicator that applies a thin strip of highlighter tape (physically similar to audio tape) instead of a felt tip. Unlike standard highlighters, they are easily erasable. They are different from “dry mark highlighters”, which are sometimes advertised as being useful for highlighting books with thin pages.

“Gel highlighters” contain a gel stick rather than a felt tip. The gel does not bleed through paper or become dried out in the pen as other highlighters’ inks may.

The German chemist Adolf von Baeyer developed indigo synthesis and synthesized fluorescein in 1871. Adolf von Baeyer developed fluorescent pens for his children, which were then also used in offices to mark text passages.

The American Sidney Rosenthal invented in 1952 the felt pen, which he then called “Magic Marker” (magic pen). The first felt-tip pen is the model “SignPen” by the company Pentel (Japan) from the year 1962, whose inventor was the Japanese Yukio Horie.

A highlighter is a felt tip writing device filled with transparent fluorescent ink. The first highlighter was invented by Dr. Frank Honn and produced by Carter’s Ink Company in 1963, using the trademarked name HI-LITER (not Sharpie) . Avery Dennison Corporation now owns the brand, having acquired Carter’s Ink Company in 1975.

Schwan-Stabilo has been producing felt tip writing devices since 1971. It is hailed as the European product leader of manufacturing highlighters. In 2003, the company has changed its name to Stabilo International.

Pins for special surfaces:
Generally you can divide felt pens into the following groups:

Paint and crayons usually write only on paper, solvents: water or alcohol
Permanent markers cover almost all substrates and remain there resistant to abrasion, solvents: Aromatic hydrocarbons or alcohol
Highlighters have a fluorescent ink dye and are not opaque but permanently adhesive, solvent: water or alcohol based
Flipchart marker, a permanent marker that covers paper with thicker felt tips. Solvent: Aromatic hydrocarbons or alcohol base
Whiteboard markers are written on specially coated white boards (so-called whiteboards) and can be wiped dry, solvents: Aromatic hydrocarbons or alcohol base

Permanent marker:
Permanent markers are felt-tip pens with an ink that are used to permanently label objects. The lettering should adhere to as many different surfaces as possible and be insensitive to light, moisture and contact. In addition, the surface should not be changed, in particular not be dissolved or roughened. A few manufacturers offer special erasers to remove the mark.

As a highlighter, marker, marker (from the English term marker [pen], actually, felt pen ‘), highlighter or light pen felt pens are called, with which one can emphasize text passages in color. As early as 1963, the US company Carter’s Ink Company developed fluorescent felt pens. Felt-tip pens with fluorescent ink were first developed and marketed in Germany by Günter Schwanhäußer of Schwan-Stabilo in 1971.

After the introduction of the felt-tip pen, which was designed as a coloring pen for children, it turned out that it was also frequently used in text-marking offices. To facilitate handling, the highlighter has been developed, which has a wider wedge-shaped tip and a much more compact shape. For these pens, transparent fluorescent dyes are used so that the desired text part is highlighted but not covered. Yellow markers are not visible on black and white photocopies. The other shades of the highlighter appear gray and make the marked parts of the text less readable.

Highlighters are available in different colors. The most common are neon colors, but also other colors, often in the assortment, are offered for text marking.

Film writer:
As a film writer called pens that adhere to substrates such as foils (for example, for overhead projectors). It is available for permanent labeling (permanent) and erasable (non-permanent).

CD markers:
A CD marker is a smudge and water resistant pen that has been specially developed for labeling CDs and DVDs. He does not attack the surface of the CD. For DVDs, however, other water-resistant markers can also be used without any problems since, unlike CDs, they have not just a thin lacquer layer but a 0.6 mm thick polycarbonate layer on the inscription side above the actual data carrier layer. Whiteboard marker [edit | Whiteboard markers or board markers are pens that are used to label whiteboards. The special feature of the writing fluid is the fast drying and wiping with a cloth or felt sponge.