[Problems] To provided are a reversibly thermochromic composition that shows black during color development by using a fluoran derivative having a specific structure as an electron-donating color-developing organic compound, turns colorless during decoloration, and is excellent in light resistance and a microcapsule pigment encapsulating the reversibly thermochromic composition.

[Solution] Disclosed is a reversibly thermochromic composition including: (a) a fluoran derivative having a specific structure as an electron-donating color-developing organic compound; (b) a compound having a specific structure as an electron-accepting compound; and (c) a reaction medium which reversibly induces an electron transfer reaction between the component (a) and the component (b) in a specific temperature range, and a reversibly thermochromic microcapsule pigment encapsulating the reversibly thermochromic composition.

To prevent ink from dripping, drying, and the like. A writing utensil includes: a shaft tube; a writing chip that protrudes more toward the front than the shaft tube so as to discharge ink when pressed against a written face; and an ink supply part that supplies ink to the writing chip from a rear side, wherein the writing chip is at a separate position that is separated toward the front across a space with respect to the ink supply part and is moved due to a predetermined operation to a contact position where the writing chip comes into contact with the ink supply part from a front side.

To prevent ink from dripping, drying, and the like.

A writing utensil includes: a shaft tube; a writing chip that protrudes more toward the front than the shaft tube so as to discharge ink when pressed against a written face; and an ink supply part that supplies ink to the writing chip from a rear side, wherein the writing chip is at a separate position that is separated toward the front across a space with respect to the ink supply part and is moved due to a predetermined operation to a contact position where the writing chip comes into contact with the ink supply part from a front side.

A refill for a writing felt pen, the refill comprising a deformable pouch and a nib inserted into the deformable pouch, the deformable pouch comprising a mix of dry absorbent polymer, fibers and dry ink.

An alcohol-based dry-erasable ink for a writing instrument including, as separation agent, a mixture of glycerol, glycol and pentaerythritol ester.

The present invention provides a liquid applicator, comprising: an applicating head, a buffer in communication with the outside air, a gas-liquid exchanger and a reservoir supplying a liquid to the gas-liquid exchanger. The gas-liquid exchanger has a wick, a liquid sealing tube covering on the outer peripheral wall of the wick, and a gas-liquid channel disposed between the wick and the liquid sealing tube; the buffer covers on the outer peripheral wall of the liquid sealing tube, and capillary pressure of the liquid sealing tube is greater than capillary pressure of the buffer by 30% or more. The liquid applicator of the invention can effectively control the release of a liquid and prevent the liquid from leaking out, and features a simple structure, smooth application and easy manufacturing.

The multi pen dry erase marker consists of two to six color dry erase pens that are spring loaded into an ergonomic housing and designed to be used with one hand only. Changing of colors is easy to do by pushing a button to add a pen color. To remove a color the pen is pushed back into the housing which locks it back in place. The end cap of the marker has a large felt or sponge tip to easily erase using a standard whiteboard. A storage cap protects the pens from drying out when being stored.

Writing instruments with flexible nibs for reduced writing force in use are provided. A nib includes a nib body having a flexible upper writing portion and a lower portion in communication with the flexible upper writing portion, the lower portion of the nib body being configured to deliver ink to the flexible upper writing portion and the flexible upper writing portion being configured to deliver ink to a writing surface, wherein the flexible upper writing portion of the nib body has a flattened chisel-shaped tip at a superior end of the flexible upper writing portion, and wherein the nib is effective to deliver ink to the writing surface upon application of a force of less than about 0.1 lbs thereto.

To provide a writing instrument capable of further improving durability of a writing nib without impairing writing performance even when writing is performed with a heavy writing load. A writing instrument A having a writing part formed of at least a writing nib 30 made of a porous body and a retainer 40 made of a hard material, in which the protrusion amount of the distal end of the writing nib 30 from the retainer 40 is 0.65 mm or more and 1.05 mm or less and/or 40% or more and 65% or less of the thickness of the writing nib 30.

To provide a pen tip that can enhance its color brilliance and color distinctiveness as well as providing a writing tool having the pen tip. A pen tip A of the present invention is a pen tip equipped with a pen core 20 containing a concealing material, and is characterized in that the pen core has the lightness (L* value) of 80 or higher in the L*a*b* (CIELAB) color system. The writing tool, for example, includes a retention body 10 having a visible part allowing visual recognition of the writing direction and the pen tip A having the above configuration and attached with the retention body 10.