Why not use two different ink brands?

Many people have the habit of changing to use a new ink often rinse the intestinal pen, then new ink in.

Do this because they know that pouring and 2 different ink often happens precipitation.

Normal blue ink uses tannin to use iron and a blue dye to produce a dilute solution. In that solution, there are usually small particles with charged particles, because the same ink, the charges of the particles have the same particles. If the characteristics are the same, push, different. Particles of small particles repel each other, there will be no precipitation into large particles.

When we mix 2 different inks, if they use the same material, nothing happens . But if you use different materials, different charges, the small particles in the ink will attract each other; The resulting particle will grow, eventually settling down in the ink bottle will appear ink residue . For example, pure green ink prepared by acidic dyes if subjected to alkaline dyes will quickly precipitate into large clumps. Not only does it stop the pen, but the color of the ink is also destroyed. The blue ink is now very pale, it looks very wild.

Knowing these causes, you will realize that a pen cannot use both two different brands of ink. If the ink runs out and wants to change to another ink, clean the new pen to absorb another ink to avoid chemical precipitation affecting the time of using the pen.