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ink,

pigmented fluid used for writing and drawing, or a viscous compound used for printing, both of various colors but most frequently black. The oldest known variety, India ink or China ink, is still used in China and Japan for writing with small brushes instead of pens. All inks are composed of a colorant, a vehicle, a solvent, and additives; the colorant for India ink is carbon black, and the vehicle is water; various substances including glue and gum are used to stabilize suspension. Because of its rich blackness and permanence, India ink is used extensively by architects, engineers, and artists. In many early civilizations dyes obtained from plants, and sepia from the squid, octopus, and cuttlefish, were used as ink. The black and blue-black inks used today, composed of copperas (ferrous sulfate), gallic and tannic acids, and a preservative, were probably known as early as the 2d cent., the acids then being derived from oak or nut galls. Numerous master drawings made with ink containing the acids of gallnuts have been corroded by the ink itself. These inks, and also the colored inks used today, contain aniline and other soluble dyes instead of holding their pigments in suspension; they are accordingly filterable and flow easily even through ball-point pens. Felt-tip markers contain organic compounds in solution. The glutinous inks used by printers owe their various viscosities to such ingredients as linseed oil, synthetics of the alkyd type, mineral oil, and petroleum fractions. This reliance on hydrocarbons has raised concern about pollution, and led to the development of several alternatives: vegetable–based inks; toluene–based inks so that the solvent can be recovered; and water–solvent inks. Marking inks used to mark linen are composed of a salt of silver. Indelible or incorrodible ink is used for writing that is exposed to the weather or to strong acids or alkaline solutions. Fluorescent inks are used in printing maps to be read at night. The liquid in the ink used in newspaper printing is absorbed into the paper, while in many other sorts of ink the liquid evaporates leaving the pigment above the paper surface.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

ink

[′iŋk]
(materials)
A dispersion of a pigment or a solution of a dye in a carrier vehicle, yielding a fluid, paste, or powder to be applied to and dried on a substrate; writing, marking, drawing, and printing inks are applied by several methods to paper, metal, plastic, wood, glass, fabric, or other substrate.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ink

a dark brown fluid ejected into the water for self-concealment by an octopus or related mollusc from a gland (ink sac) near the anus
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
To mark the 50th anniversary of this historic event, documentary filmmaker Todd Douglas Miller rifles through archive footage to relive the day when humanity blasted into the inky void of space and planted a flag in previously uncharted territory with a glorious view of the third rock from the sun.
The magician, whose catchphrase "Inky Pinky Plinky Plonk" delighted audiences for decades, died at the age of 58 in 1987.
Under an inky night in Derry and the cover of choking smoke from burning tyres, a coward from a group calling itself the New Irish Republican Army took aim at a police Land Rover and fired off a volley of shots.
Stylish inky blue is the perfect shade - it works as a neutral, meaning it goes with everything, plus it hides dirt and marks!
A DRAWING featuring an inky thumb print left by Leonardo da Vinci more than 500 years ago is being exhibited in Cardiff.
Persons from the inky fraternity, including the management and staff of Atinka Media Village and sympathisers, took turns to file past the remains of the late Sasu to pay their last respects.
It's time to get the (inky) blues Potted succulent by Aufora, PS7, Houzz.co.uk
I recently completed a study examining titles that have won two popular Australian YA literature awards: The Children's Book Council of Australia's (CBCA) Book of the Year for Older Readers and the Inky Gold Awards.
All clothes from Emma Willis' edit at Next Red button stitch sweater PS24, super high waist inky skinny jean PS42, blue blanket scarf PS16 Tartan button through pyjamas PS38, Fairisle cardigan PS45 Bardot black dress PS34, barely there black shimmer sandals PS34, black glitter clutch PS24 Neppy doublebreasted jacket PS62, wide leg trousers PS38, Premium stud patent brogues PS45 White revere collar coat PS88
Carol Weatherall has four due to trial - Calico Blackjack, Calico Ranger, Holdem Zidane and Inky Holdem - although the exact composition of the raiding party is yet to be decided.