A marking composition for marking a tissue specimen is provided. The marking composition includes a film forming resin including an acrylic resin, a rheology modifier including an associative polyurethane, a phyllosilicate, a cellulose, or a combination thereof, and a colorant. The composition has a viscosity of about 70 KU to about 110 KU at room temperature. If the composition includes a rheology modifier comprising cellulose, it is in an amount of about 0.01 wt % to about 0.25 wt % based on the total weight of the composition.

A marking composition for marking a tissue specimen is provided. The marking composition includes a film forming resin including an acrylic resin, a rheology modifier including an associative polyurethane, a phyllosilicate, a cellulose, or a combination thereof, and a colorant. The composition has a viscosity of about 70 KU to about 110 KU at room temperature. If the composition includes a rheology modifier comprising cellulose, it is in an amount of about 0.01 wt % to about 0.25 wt % based on the total weight of the composition.

A whitish writing and/or marking fluid, in particular white writing and/or marking fluid, for writing instruments, in particular for capillary writing instruments, or for cosmetic applications, that has a viscosity of less than 30 mPa s (Brookfield, 20° C., cone plate CPE-40), and contains 5 to 15 wt % of an anionic dispersion of a hard resin, an aqueous titanium dioxide dispersion, and a preservative.

A whitish writing and/or marking fluid, in particular white writing and/or marking fluid, for writing instruments, in particular for capillary writing instruments, or for cosmetic applications, that has a viscosity of less than 30 mPa s (Brookfield, 20° C., cone plate CPE-40), and contains 5 to 15 wt % of an anionic dispersion of a hard resin, an aqueous titanium dioxide dispersion, and a preservative.

An aqueous ink composition suitable for ballpoint pens may achieve excellent smooth writing without causing deterioration of the smooth writing and wear of a tip socket while colored resin particles encapsulating a pigment are used. An embodiment of such ink compositions is an aqueous ink composition suitable for ballpoint pens containing at least colored resin particles (A) encapsulating a pigment (a) and non-colored resin particles (B) containing no pigment.

An aqueous ink composition suitable for ballpoint pens may achieve excellent smooth writing without causing deterioration of the smooth writing and wear of a tip socket while colored resin particles encapsulating a pigment are used. An embodiment of such ink compositions is an aqueous ink composition suitable for ballpoint pens containing at least colored resin particles (A) encapsulating a pigment (a) and non-colored resin particles (B) containing no pigment.

[Object] To provide an ink composition having excellent dispersion stability and writing performance.

[Resolution Means] Provided are a composite colored particle including a resin particle carrying a positive electric charge on a particle surface, a colored particle carrying a negative electric charge on a particle surface, and a low-density particle, the colored particle and the low-density particle forming a composite with the resin particle through Coulomb force; a water-based ink composition containing the composite colored particles dispersed in a water-based medium; and a writing instrument loaded with the water-based ink composition.

[Object] To provide an ink composition having excellent dispersion stability and writing performance.

[Resolution Means] Provided are a composite colored particle including a resin particle carrying a positive electric charge on a particle surface, a colored particle carrying a negative electric charge on a particle surface, and a low-density particle, the colored particle and the low-density particle forming a composite with the resin particle through Coulomb force; a water-based ink composition containing the composite colored particles dispersed in a water-based medium; and a writing instrument loaded with the water-based ink composition.

Provided is an aqueous ink composition for writing instruments containing colored resin particles encapsulating a pigment, wherein the ink is not repelled when the aqueous ink composition for writing instruments is used to write on a paper face attached with hand fingers or the like, and achieves a uniform density in a drawn line and excellent writing capability. An embodiment of the aqueous ink composition for writing instruments is an aqueous ink composition for writing instruments containing at least a pigment (a) and colored resin particles (A) encapsulating the pigment (a).

Provided is an aqueous ink composition for writing instruments containing colored resin particles encapsulating a pigment, wherein the ink is not repelled when the aqueous ink composition for writing instruments is used to write on a paper face attached with hand fingers or the like, and achieves a uniform density in a drawn line and excellent writing capability. An embodiment of the aqueous ink composition for writing instruments is an aqueous ink composition for writing instruments containing at least a pigment (a) and colored resin particles (A) encapsulating the pigment (a).