Abstract: There is a thermochromic ink composition having core-shell microcapsules, an aqueous dispersion medium and a decolorization agent.

Abstract: A kit comprising a) an aqueous writing ink composition, containing—metal nanoparticles as coloring agent wherein the metal nanoparticles essentially consists of metal and the metal is chosen from silver, gold, aluminum and/or copper and—a dispersing agent, and b) an eradicator fluid containing at least one oxidizing agent. An aqueous eradicator fluid for erasing an aqueous writing ink composition containing metal nanoparticles as the coloring agent, in which the fluid contains an oxidizing agent and—a volatile solvent. A writing instrument containing the eradicator fluid, the use of the eradicator fluid and/or of the kit containing it and a method of correcting errors of a written mark made on a porous substrate.

Abstract: The present invention concerns a kit comprising a) an aqueous writing ink composition, containing—metal nanoparticles as coloring agent wherein said metal nanoparticles essentially consists of metal and said metal is chosen from silver, gold, aluminum and/or copper and—a dispersing agent, and b) an eradicator fluid containing at least one oxidizing agent. It also concerns an aqueous eradicator fluid for erasing an aqueous writing ink composition containing metal nanoparticles as the coloring agent, in which said metal nanoparticles said fluid containing—an oxidizing agent and—a volatile solvent. It further concerns a writing instrument containing the eradicator fluid, the use of the eradicator fluid and/or of the kit containing it and a method of correcting errors of a written mark made on porous substrate.

Abstract: The present disclosure relates to a system comprising a writing instrument. The writing instrument comprises an ink. wherein the ink comprises a coloring agent and a bonding agent. The adhesiveness of the bonding agent can be altered by applying a voltage or a voltage and a current. Further. the system comprises a writing surface comprising a first electrode and a second electrode or a writing surface comprising a first electrode and an erasing tool comprising a second electrode.

Abstract: The present disclosure relates to a eradicable non-aqueous writing ink comprising a solvent, a gelling agent and a pH-sensitive water-soluble dye. The solvent is selected from 1,2-propanediol, diethylene glycol, monoethylene glycol and dimethylsulfoxide and/or mixtures thereof. The gelling agent comprises water-insoluble cellulose nanofibers and/or a mixture of silica particles and of a fatty acid amide wax. The pH-sensitive water-soluble dye is capable of changing from an initially colored state to a discolored state when the writing ink is exposed to an ink eradicator composition.

Abstract: The present disclosure concerns non-aqueous gel writing ink including a solvent, a coloring agent and a gelling agent, in which the gelling agent is a mixture of silica particles and of a fatty acid amide wax. It also concerns the process of preparation of the non-aqueous gel writing ink and the use of a mixture of silica particles and of a fatty acid amide wax, as a gelling agent in a non-aqueous gel writing ink. It finally concerns a writing instrument containing the ink according to the present disclosure.

Abstract: There is an erasing tool having a polyetheramine for erasing a thermochromic ink composition capable of undergoing a color change that cannot be reversed by application of a temperature change. There also is a writing instrument having a thermochromic ink composition and an erasing tool. Finally, there is a method for irreversibly erasing a written line made with a thermochromic ink composition and erased with an erasing tool.

Abstract: The present disclosure relates to pens comprising a non-aqueous writing ink comprising a solvent, a coloring agent, a resin, a gelling agent, and a homo or copolymer of vinylpyrrolidone, wherein the gelling agent is a mixture of silica particles and of a fatty acid amide wax, and wherein the homo or copolymer of vinylpyrrolidone is present in amounts of between about 0.05 and about 0.6 wt.-%, relative to the total weight of the ink.

Abstract: Pens comprise a non-aqueous writing ink comprising a solvent, a coloring agent, a resin, a gelling agent, and a homo or copolymer of vinylpyrrolidone and/or a polyvinyl alcohol which is acetalized with an aldehyde comprising between 1 and about 6 carbon atoms, wherein the gelling agent is a mixture of silica particles and of a fatty acid amide wax, wherein the homo or copolymer of vinylpyrrolidone, if present, is present in amounts of between about 0.05 and about 0.6 wt.-%, relative to the total weight of the ink and wherein the polyvinyl alcohol which is acetalized with an aldehyde comprising between 1 and about 6 carbon atoms, if present, is present in amounts of between about 0.05 and about 1.0 wt.-%, relative to the total weight of the ink.

Abstract: There is a non-aqueous gel writing ink having an organic solvent, a coloring agent and a gelling agent, and the gelling agent is non-oxidized cellulose nanofibers. There also is a use of non-oxidized cellulose nanofibers as a gelling agent in a non-aqueous gel writing ink. There is finally a writing instrument having the ink according to the present disclosure.

Abstract: There is an erasing tool having a polyetheramine for erasing a thermochromic ink composition capable of undergoing a color change that cannot be reversed by application of a temperature change. There also is a writing instrument having a thermochromic ink composition and an erasing tool. Finally, there is a method for irreversibly erasing a written line made with a thermochromic ink composition and erased with an erasing tool.

Abstract: There is a thermochromic ink composition having core-shell microcapsules, an aqueous dispersion medium and a decolorization agent.

Abstract: The present disclosure concerns non-aqueous gel writing ink including a solvent, a coloring agent and a gelling agent, in which the gelling agent is a mixture of silica particles and of a fatty acid amide wax. It also concerns the process of preparation of the non-aqueous gel writing ink and the use of a mixture of silica particles and of a fatty acid amide wax, as a gelling agent in a non-aqueous gel writing ink. It finally concerns a writing instrument containing the ink according to the present disclosure.

Abstract: A device for reproducing a color on demand. The device includes a body including a tip and a scanner. The body also includes a control unit, a plurality of ink reservoirs, an ink supply system, a mixing tank and a sensor. The control unit communicates with the scanner and ink supply system to reproduce a desired color that has been scanned.

Abstract: A device for reproducing a color on demand. The device includes a body including a tip and a scanner. The body also includes a control unit, a plurality of ink reservoirs, an ink supply system, a mixing tank and a sensor. The control unit communicates with the scanner and ink supply system to reproduce a desired color that has been scanned.