How does pen water and ink fade?

Answer:

Ink in the carbon, carbon outermost layer of the number of electronic 4 ~ chemical stability, it is not easy to fade

(C4H10O9), gallic acid (C7H6O5? H2O) and ferrous sulfate (FeSO4) and other components are combined with each other to produce ferrous tannate and ferrous gallate, after oxidation have become insoluble high-priced iron, that is tanning Acid and ferric acid, the former to enhance water resistance, which enhance the black, so that the ink water, black, color lasting does not fade.

The main raw materials of ink for the soot, rubber compounds, additives and solutions, generally processed by mechanical processing. Not easy to fade.

Pen water that is carbon ink, carbon ink is the main component of carbon (C), carbon at room temperature and pressure chemical properties are very stable, not easy to react with other substances. So the words written in carbon ink easy to save, not easy to fade.