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2. List of pen types, brands and companies - Wikipedia

   en.wikipedia.org/wiki/List_of_pen_types,_brands...

   A pen is a handheld device used to apply ink to a surface, usually paper, for writing or drawing. [1] Additional types of specialized pens are used in specific types of applications and environments such as in artwork, electronics, digital scanning and spaceflight, and computing.

3. Fountain pen ink - Wikipedia

   en.wikipedia.org/wiki/Fountain_pen_ink

   The ideal fountain pen ink is free-flowing, free of sediment, and non-corrosive. These qualities may be compromised in the interests of permanence, manufacturability and in order to use some widely available dyes. [ 4] A form of ink that predates fountain pens by centuries is iron gall ink. This blue-black ink is made from iron salts and tannic ...

4. Polygraph (duplicating device) - Wikipedia

   en.wikipedia.org/wiki/Polygraph_(duplicating_device)

   Polygraph (duplicating device) A Polygraph is a duplicating device that produces a copy of a piece of writing simultaneously with the creation of the original, using pens and ink. Patented by John Isaac Hawkins on May 17, 1803, it was most famously used by the third U.S. president, Thomas Jefferson, who acquired his first polygraph in 1804 and ...

5. Conductive ink - Wikipedia

   en.wikipedia.org/wiki/Conductive_ink

   Conductive ink is an ink that results in a printed object which conducts electricity. It is typically created by infusing graphite or other conductive materials into ink. [ 1] There has been a growing interest in replacing metallic materials with nanomaterials due to the emergence of nanotechnology. Among other nanomaterials, graphene, and ...

6. Iron gall ink - Wikipedia

   en.wikipedia.org/wiki/Iron_gall_ink

   Iron gall ink (also known as common ink, standard ink, oak gall ink or iron gall nut ink) is a purple-black or brown-black ink made from iron salts and tannic acids from vegetable sources. It was the standard ink formulation used in Europe for the 1400-year period between the 5th and 19th centuries, remained in widespread use well into the 20th ...

7. Inkjet printing - Wikipedia

   en.wikipedia.org/wiki/Inkjet_printing

   Inkjet printing is a type of computer printing that recreates a digital image by propelling droplets of ink onto paper and plastic substrates. [ 1] Inkjet printers were the most commonly used type of printer in 2008, [ 2] and range from small inexpensive consumer models to expensive professional machines.