The main raw materials of ink are soot, rubber, additives and solutions, which are generally machined.

Pen ink is usually a mixture of tannic acid and iron salt (usually ferrous sulfate). These inks are in a translucent liquid state. Once coated on parchment, the slow chemical reaction between acid and salt will leave a black residue, which will penetrate into the paper and leave a permanent mark. Gum Arabic (a water-soluble thickener) added to ink helps ink flow better and stay on paper. So it can't be used.

Extended data:

Precautions:

1, moderate concentration: even the light pen in calligraphy and painting works is written in thick ink, and the difference lies in the amount of ink dipped, not the depth of ink. If the ink contains too much water, the pen will spread quickly when it touches the paper, forming ink clouds of different sizes and shapes. Writing with ink as thick as half jelly is also terrible. You also need to remember to use white paper, especially thick ink. If you use colored paper, it can be a little lighter. ?

2. Use with grinding: The ink must be ground again, because if the ink is left for more than one day, the glue and coal will gradually separate, and the ink will be dull and not durable, so it is easy for Su Mo to fade when used as a book. Some ready-made inks sold in the market are sticky and sticky, some are too low in concentration, paper is easy to melt when dropped, and there are many preservatives, which are easy to damage the nib and should not be used. ?

3. Store in the box: Take out the ink after grinding, and don't put the inkstone. Otherwise, the glue is easy to stick to the inkstone pool, and it is not easy to take off when it is dry, and it will also prevent it from softening due to moisture, resulting in both losses. You can't expose yourself to the sun to avoid drying. So it's best to put it in a box, which is the best way to prevent moisture and avoid direct sunlight and dust. ?

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