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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 ...
Not only does it mold quickly in high humidity environments, but early forms of ink that were commonly used on papyrus could simply be washed off without leaving a trace. It is believed that "Iron gall inks were devised to overcome this disadvantage," however even these inks can be wiped off fairly thoroughly if they are scrubbed (Langwell 43).
Other consequences of aqueous treatment are a change of ink texture or formation of plaque on the surface of the ink (Reibland & de Groot 1999). Iron gall inks require storage in a stable environment, because fluctuating relative humidity increases the rate that formic acid, acetic acid, and furan derivatives form in the material the ink was ...
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This iron gall ink recipe is taken from the Household Cyclopedia of General Information, published in 1881. It is not in common use now, though the preparation of inks with similar methods was common at one time. Recipe for one imperial gallon (4.5 L) of ink: 12 ounces (340 g), nut-galls; 8 ounces (230 g), sulfate of indigo; 8 ounces (230 g ...
Iron gall ink is produced by treating a solution of tannins with iron(II) sulfate. [72] Tannins can also be used as a mordant, and is especially useful in natural dyeing of cellulose fibers such as cotton. [73] The type of tannin used may or may not have an impact on the final color of the fiber.