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Are blue black ink bags the same as dark blue ink bags

Blue black ink bag is different from dark blue ink bag. Blue black is a color between blue and black, and the color of blue black ink is blue. Dark blue is a dark blue close to black, and the color of dark blue ink is black. Ink bag is a tube containing ink, which is mainly used to replace the ink core of supporting pen. Is blue black ink bag the same as dark blue ink bag? Blue black ink is a dye ink prepared with acid ink blue. Acid ink blue is a water-soluble acid dye, which is easy to fade over time.

Therefore, tannic acid or gallic acid is generally added to blue black ink to form colorless ferrous tannate or colorless ferrous gallic acid soluble in water with ferrous sulfate.

They will be oxidized in contact with air, resulting in black or blue black high-grade complex precipitation, which makes the ink color lasting. (LanHeiSeMoNangHeMoLanSeMoNangYiYangMa)