The instant disclosure is directed to a heterogeneous fiber fluid reservoir for holding and delivering fluid. A reservoir may comprise a rod having a core component and a surrounding component. Each of the core component and the surrounding component may comprise fibers. The core component may have a first property, and the surrounding component may have a second property different from the first property, or the core component and the surrounding component may each have a different value or range of values for the same property. Alternatively, a reservoir may comprise a rod that includes fibers and has a cross-sectional diameter. At least one property of the rod may vary in value along the cross-sectional diameter of the rod. The property may include, for example, fiber bulk density, fiber diameter, fiber material, fiber morphology, fiber surface tension, capillary force, fluid absorption capacity, color, or combinations thereof.

Provided is a liquid (e.g., ink) storage member for coating tools to reduce the consumption of plastic and the environmental impact by substituting paper base material for plastics such as polypropylene. The liquid storage member has at least three layers as follows: an inner layer made of paper base material and an intermediate layer of a paper base laminate comprising a metal layer or a silica vapor deposition layer formed on the outer surface side of the paper-based inner layer; and an outer layer made of paper base material formed on the outer surface side of the intermediate layer. The paper base laminate is wound into a spiral shape and on the outer surface side of the intermediate layer, the outer layer is also wound into a spiral shape. A polyolefin resin-containing adhesive layer lies in between the inner and intermediate layers and/or between the intermediate and outer layers.

Provided is a liquid (e.g., ink) storage member for coating tools to reduce the consumption of plastic and the environmental impact by substituting paper base material for plastics such as polypropylene. The liquid storage member has at least three layers as follows: an inner layer made of paper base material and an intermediate layer of a paper base laminate comprising a metal layer or a silica vapor deposition layer formed on the outer surface side of the paper-based inner layer; and an outer layer made of paper base material formed on the outer surface side of the intermediate layer. The paper base laminate is wound into a spiral shape and on the outer surface side of the intermediate layer, the outer layer is also wound into a spiral shape. A polyolefin resin-containing adhesive layer lies in between the inner and intermediate layers and/or between the intermediate and outer layers.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.

A thermochromic writing instrument including a writing body, storing a thermochromic ink therein, stored in a barrel; an operation body provided in the barrel to be operated to longitudinally move the writing body; a nib of the writing body configured to be capable of appearing from a front end of the writing instrument, wherein the writing instrument 1 further includes a friction unit, for rubbing handwriting in the thermochromic ink and capable of thermally changing the color of the handwriting by frictional heat generated at that time, and at least one clip body as the operation body, the friction unit 10 is provided at a rear end of the barrel, and the clip body is provided in an area other than the rear end of the barrel.

The ink composition contains titanium oxide particles having an average particle size of 0.1 m or more and 0.4 m or less, hollow resin particles having an average particle size of 1.0 m or more and 2.0 m or less, a polysaccharide and water, wherein the titanium oxide particles and the hollow resin particles are negatively charged.

The ink composition contains titanium oxide particles having an average particle size of 0.1 m or more and 0.4 m or less, hollow resin particles having an average particle size of 1.0 m or more and 2.0 m or less, a polysaccharide and water, wherein the titanium oxide particles and the hollow resin particles are negatively charged.

A refill for writing implements has an ink reservoir tube (1) made of resin material and formed to be a straight cylinder and a writing tip (2) attached to one end of the ink reservoir tube (1), and a value of an expression of D.sup.4(D2t).sup.4 is selected to be 45 or greater, where D denotes an outer diameter of the ink reservoir tube (1) and t denotes a thickness of the ink reservoir tube (1). It is possible to secure the necessary storage amount of ink in the ink reservoir tube (1) without increasing the outer diameter thereof, and is also possible to provide a refill for a writing implement and a writing implement which allow one to keep writing comfortably without feeling of discomfort in writing.

A ballpoint dot pen tattoo cartridge includes a ballpoint pen element comprising an ink reservoir housed within a tapered bottom barrel providing a first barrel aperture and flanged top surface. A second barrel aperture in cylindrical top of the barrel includes a diameter larger than the first aperture with an assembly to attach the barrel cylindrical top to a tattoo machine. A resilient element within the barrel is sized to receive the ballpoint pen element between the first barrel aperture flanged top surface and two equal sized tabs on the ballpoint pen providing exit and retraction of the ballpoint pen assembly for ink discharge from the cartridge barrel tapered bottom whereby a tattoo machine operator controls the driving actuation of the tattoo machine to the ballpoint pen tip for controlling inked markings of a material.

A ballpoint dot pen tattoo cartridge includes a ballpoint pen element comprising an ink reservoir housed within a tapered bottom barrel providing a first barrel aperture and flanged top surface. A second barrel aperture in cylindrical top of the barrel includes a diameter larger than the first aperture with an assembly to attach the barrel cylindrical top to a tattoo machine. A resilient element within the barrel is sized to receive the ballpoint pen element between the first barrel aperture flanged top surface and two equal sized tabs on the ballpoint pen providing exit and retraction of the ballpoint pen assembly for ink discharge from the cartridge barrel tapered bottom whereby a tattoo machine operator controls the driving actuation of the tattoo machine to the ballpoint pen tip for controlling inked markings of a material.