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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 ...
Ink is a gel, sol, or solution that contains at least one colorant, such as a dye or pigment, and is used to color a surface to produce an image, text, or design. Ink is used for drawing or writing with a pen, brush, reed pen, or quill. Thicker inks, in paste form, are used extensively in letterpress and lithographic printing.
Some users mix inks to create their own colours. Some combinations of inks may cause unexpected colour changes, even if the inks are from the same manufacturer. This is a result of chemical reactions between the different components. The colour of many dyes depends on pH, and some lose their colour entirely outside a certain pH range.
Most markers have alcohol-based solvents. Other types, called paint markers, contain volatile organic compounds which evaporate to dry the ink, and are similar to spray paint. Due to solvents such as toluene and xylene often being present in permanent markers, they have a potential for abuse as a recreational drug.
A formula similar to oak gall ink was created by James Jay and used by George Washington and the Culper Spy Ring during the American Revolution and lemon juice was used by the 'Lemon Juice Spies' (Carl Muller and four other Germans, who all died for their efforts either by suicide or execution, along with John Hahn, an English baker) during ...
A voter's left hand index finger stained with election ink. 15th Malaysian general election. Electoral stain is a practical security feature to prevent double voting in elections. Ink is typically applied to the left-hand thumb, over the nail and finger in a straight line, especially to the cuticle, where it is almost impossible to remove ...
The chemical formula usually ranges from C 32 H 3 Cl 13 CuN 8 to C 32 HCl 15 CuN 8. ... It is a standard pigment used in printing ink and packaging industry.
Quinacridone is an organic compound used as a pigment.Numerous derivatives constitute the quinacridone pigment family, which finds extensive use in industrial colorant applications such as robust outdoor paints, inkjet printer ink, tattoo inks, artists' watercolor paints, and color laser printer toner.