A marker nib for applying ink to a surface may comprise an applicator having a writing tip configured to contact the surface to apply ink thereto, and a transporter configured to transport ink received from a reservoir to the applicator, the applicator being configured to increase its ink flow rate at the writing tip when pressure is applied thereto.

A marker nib for applying ink to a surface may comprise an applicator having a writing tip configured to contact the surface to apply ink thereto, and a transporter configured to transport ink received from a reservoir to the applicator, the applicator being configured to increase its ink flow rate at the writing tip when pressure is applied thereto.

An object is to provide a writing implement allowing the width of a drawn line to be freely changed by writing pressure that is capable of application to a narrow-shafted felt-tip pen or marker pen. The writing implement includes a shall tube, an ink supply core that is housed inside the shaft tube and that guides ink by capillary action, and a core surrounding member that is fitted to a leading end of the shaft tube, that is penetrated by the ink supply core, and from which a tip of the ink supply core projects. The ink supply core is configured to retract at a tip of the core surrounding member under writing pressure, and a projection dimension of the ink supply core from the tip of the core surrounding member is from 0.05 mm to 0.7 mm.

An object is to provide a writing implement allowing the width of a drawn line to be freely changed by writing pressure that is capable of application to a narrow-shafted felt-tip pen or marker pen. The writing implement includes a shall tube, an ink supply core that is housed inside the shaft tube and that guides ink by capillary action, and a core surrounding member that is fitted to a leading end of the shaft tube, that is penetrated by the ink supply core, and from which a tip of the ink supply core projects. The ink supply core is configured to retract at a tip of the core surrounding member under writing pressure, and a projection dimension of the ink supply core from the tip of the core surrounding member is from 0.05 mm to 0.7 mm.

A marker nib for applying ink to a surface may comprise an applicator having a writing tip configured to contact the surface to apply ink thereto, and a transporter configured to transport ink received from a reservoir to the applicator, the applicator being configured to increase its ink flow rate at the writing tip when pressure is applied thereto.

A marker nib for applying ink to a surface may comprise an applicator having a writing tip configured to contact the surface to apply ink thereto, and a transporter configured to transport ink received from a reservoir to the applicator, the applicator being configured to increase its ink flow rate at the writing tip when pressure is applied thereto.

The present invention concerns a process for preparing in situ an aqueous gel ink with fixed color comprising the following steps: (i) preparing a gel-based matrix of aqueous ink comprising ester(s) of retinol represented by formula (I), and (ii) adding a solution of gold salts (Au3+) to the gel-based matrix of aqueous ink prepared in step (i), to obtain an aqueous gel ink with fixed color with gold nanoparticles dispersed therein. The present invention also relates to an aqueous gel ink with fixed color obtained according to the process of the invention, comprising said ester of retinol represented by formula (I) and gold nanoparticles. The invention finally concerns a writing instrument comprising an aqueous gel ink with fixed color according to the invention.

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The application relates to a color linker comprising a base segment including a first portion and a second portion, each of which are configured to allow ink to flow therethrough, and a barrier positioned between the first and second portions, the barrier being configured to prevent the exchange of ink between the first and second portions; a mixing segment adjacent to the base segment, a tip segment adjacent to the mixing segment, and a tip applicator adjacent to the tip segment, the tip applicator being configured to deposit ink onto a writing surface.

The application relates to a color linker comprising a base segment including a first portion and a second portion, each of which are configured to allow ink to flow therethrough, and a barrier positioned between the first and second portions, the barrier being configured to prevent the exchange of ink between the first and second portions; a mixing segment adjacent to the base segment, a tip segment adjacent to the mixing segment, and a tip applicator adjacent to the tip segment, the tip applicator being configured to deposit ink onto a writing surface.

The present invention concerns a process for preparing in situ an aqueous gel ink with variable color comprising the following steps: (i) preparing a gel-based matrix of aqueous ink comprising an N-Acyl-aminophenol, wherein said hydroxyl group is preferably in meta or in para position on the benzenic group, and (ii) adding a solution of silver salts to the gel-based matrix of aqueous ink prepared in step (i), to obtain an aqueous gel ink with variable color with silver nanoparticles dispersed therein. The present invention also relates to an aqueous gel ink with variable color obtained according to the process of the invention, comprising an N-Acyl-aminophenol, wherein said hydroxyl group is preferably in meta or in para position on the benzenic group and silver nanoparticles. The invention finally concerns a writing instrument comprising an aqueous gel ink with variable color according to the invention.