Writing Ink

Name:
Writing Ink
Detailed information:
A solution of colorant in water, usually containing also low concentrations of tannic or gallic acid. Washable inks contain glycerol. Various water-soluble dyes are used for colored inks; dispersions of carbon black stabilized with a protective colloid are used for drawing inks. Fountain pen inks retain the fluidity of water; for ballpoint pens the mixture is of a pastelike consistency.