What is the chemical formula of ink?

24-09-2022

1. Darkening and lasting ingredients:

Mainly, tannic acid (C4H10O9), gallic acid (C7H6O5? H2O) and ferrous sulfate (FeSO4) and other components combine with each other to form ferrous tannate and ferrous gallate, which become insoluble high-valent iron after oxidation, namely tanning Iron acid and iron gallate, the former enhances water resistance, and the latter enhances blackening, so that the ink is water-resistant, blackened, and color lasting.

2. Pigment ingredients:

Acid ink blue and direct lake blue dyes are commonly used today. Black water blue is the main color of the ink. The aqueous solution does not deteriorate when exposed to acid, but turns brown when exposed to alkali. Direct lake blue plays an auxiliary role in the ink. Because it contains a lot of impurities, it is not suitable to use it more, and it is easy to grow mildew in a humid environment.

3. Stabilizer:

The purpose of adding a stabilizer to the ink is to eliminate the precipitation of the ink, so as to avoid water breakage during writing. Commonly used stabilizers are sulfuric acid (H2SO4), oxalic acid (COOH) 2, formaldehyde (HCHO) solution. These stabilizers all have a certain degree of acidity, which has buried potential harm to the acidification of paper, and should not be used frequently.

4. Resist:

Because the stabilizer added to the ink has a strong acidity, in order to prevent corrosion, a resist is often added to form a film with iron, reducing the corrosion effect of sulfuric acid by 90%. So that the iron content in the ink will not increase due to corrosion of the nib, thereby increasing the stability of the ink.

5. Wetting agent:

In order to prevent the water in the ink from evaporating and causing inconvenience to writing, add glycerol [C3H5(OH)3], which is not volatile and has water absorption, to the ink to keep the pen tip wet for writing.

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