Ink of marking pens
Basic Ink Configuration
Oily organic solvent + dye + resin + surfactant,
Water-based is the basic structure of the aqueous + dye + moisturizing Agent + surfactant + preservative.
As for the oily ink, it may be felt that it is volatile high and the smell is strong, but I use a high-safety solvent (ethyl alcohol, etc.), and, please worry.