BLACK FELT TIP PEN FOR HIDING TONER CHARACTER

摘要

PROBLEM TO BE SOLVED: To provide an aqueous black felt tip pen of a raw ink type not using an absorber, for hiding a toner character, capable of hiding an address, a name and the like of a direct mail or a debit statement.

SOLUTION: This black felt tip pen for hiding the toner character comprises: aqueous ink comprising a black pigment having 12-30 μm of particle size, an aqueous resin, silicon dioxide of fine powder and water; a pen core with a synthetic fiber bonding-cured by a binder resin to bring 70-80% of porosity; and a pen holder.

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