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Process of preparation of an aqueous gel ink with fixed color comprising gold nanoparticles
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Process of preparation of an aqueous gel ink with variable color comprising silver nanoparticles
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Process for preparing an aqueous gel ink with fixed color comprising silver or gold nanoparticles
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Process of preparation of an aqueous gel ink with fixed color comprising gold nanoparticles
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Color changing aqueous ink
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Solid ink composition and water-based ink composition comprising the same
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Retractable element for a writing implement
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Ball point tip and writing instrument fitted with such a ball point tip
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Erasable aqueous ink
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Non newtonian ballpoint pen ink comprising cellulose nanofibers
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Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
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Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
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Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
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Lead casing for pencil, and pencil thereof for writing, drawing, marking, plotting, and coloring
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Nib for writing felt pen
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Nib for writing felt pen
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A refillable free ink writing instrument provided with a removable tip
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