Provided is an ink composition for water-based ballpoint pens, which can provide excellent low-viewing angle visibility on a dark-colored writing surface and drawing lines with good luster. The ink composition for water-based ballpoint pens according to the present invention includes at least an aluminum pigment and titanium oxide-enclosing resin particles having an average particle size from 0.5 to 3 μm.

Provided is an ink composition for water-based ballpoint pens, which can provide excellent low-viewing angle visibility on a dark-colored writing surface and drawing lines with good luster. The ink composition for water-based ballpoint pens according to the present invention includes at least an aluminum pigment and titanium oxide-enclosing resin particles having an average particle size from 0.5 to 3 μm.

A molten gold writing apparatus that includes a barrel extending from a top end to an open bottom end. A heating element is positioned within the barrel and includes a rechargeable battery. A cartridge includes a refillable chamber configured to hold a solid gold refill and dimensioned to fit within the heating element. The heating element melts the gold refill and allows it to flow to a tip end of the cartridge. A grip is configured to selectively engage the bottom end of the barrel to cover all but the tip end of the cartridge.

Disclosed herein are a water-based ink composition for writing instruments excellent not only in handwriting fastness, such as handwriting water resistance, and dispersion stability but also in various properties such as dry-up resistance and handwriting density and a writing instrument using the same. The water-based ink composition for writing instruments contains a self-dispersible pigment, α-glucan or an α-glucan derivative, and water. The writing instrument contains the water-based ink composition for writing instruments. Also disclosed herein is a cartridge ink for writing instruments containing the water-based ink composition for writing instruments.

An oil-based ballpoint pen includes: an ink container configured to accommodate an ink composition for the oil-based ballpoint pen, the ink composition containing colorant, alkylene glycol alkyl ether, and polyacrylic resin; and a ballpoint pen tip configured to rotatably hold a ball at one end thereof in an extending direction of the ink container. A ratio of an ink consumption (mg) per writing distance of 100 m to a diameter (mm) of the ball is 30 or more.

An oil-based ballpoint pen includes: an ink container configured to accommodate an ink composition for the oil-based ballpoint pen, the ink composition containing colorant, alkylene glycol alkyl ether, and polyacrylic resin; and a ballpoint pen tip configured to rotatably hold a ball at one end thereof in an extending direction of the ink container. A ratio of an ink consumption (mg) per writing distance of 100 m to a diameter (mm) of the ball is 30 or more.

A molten gold writing apparatus is disclosed. The molten gold writing apparatus includes a barrel extending from a top end to an open bottom end. A heating element is positioned within the barrel and includes a rechargeable battery. A cartridge includes a refillable chamber configured to hold a solid gold refill and dimensioned to fit within the heating element. The heating element melts the gold refill and allows it to flow to a tip end of the cartridge. A grip is configured to selectively engage the bottom end of the barrel to cover all but the tip end of the cartridge.

High opacity permanent ink formulations comprising a solvent, a polymer-based opacifier, a coloring agent, a resin, and a humectant, wherein the ink formulation displays a viscosity of less than about 50 cP, are provided herein.

High opacity permanent ink formulations comprising a solvent, a polymer-based opacifier, a coloring agent, a resin, and a humectant, wherein the ink formulation displays a viscosity of less than about 50 cP, are provided herein.

A liquid ink instrument, including: a pen body, a writing element mounted on the head of the pen body, an ink absorber mounted at the rear end of the writing element; a fiber ink feeder mounted in the body penetrates the ink absorbing body, the front end in contact with the writing element, the rear end communicated with the ink cartridge; at least one air-liquid balancer in the axial direction, the air-liquid balancer installed between the recited fiber ink feeder and the body; having one or more air-liquid exchange grooves penetrating through the outer circumferential surface; having an overflow groove on a radial surface of the air-liquid balancer, one end contacted to fiber ink feeder, and the other end communicating with air-liquid exchange groove; a gas-free fit or an interference fit adopted between the outer circumferential surface of the fiber ink feeder and the inner wall of the air-liquid balancer.