WATER-ERASABLE WATER-BASED INK COMPOSITION AND AQUEOUS PEN USING THE SAME

PROBLEM TO BE SOLVED: To provide a water-erasable water-based ink composition excellent in shorthand writing property, water-erasability, fastness in dryness, and dry-up resistance and capable of obtaining a writing line improving light resistance.SOLUTION: The water-erasable water-based ink composition contains a sugar mixture and a pigment as a coloring material and the sugar mixture is contained in the composition both in a content of tetra-saccharides to nona-saccharides of 35 mass% or more based on the total amount of the sugar mixture and in a content of deca- or more saccharides or more of 45 mass% or less based on the total amount of the sugar mixture. The sugar mixture is contained in the composition in a content of 5-20 mass% based on the total amount of the water-erasable water-based ink composition. 【課題】速記性、水消去性、乾燥時堅牢性及び耐ドライアップ性がいずれも良好であり、且つ、耐光性が向上した筆記線を得ることができる水消去性水性インキ組成物を提供する。【解決手段】糖混合物と、色材としての顔料とを含有する水消去性水性インキ組成物であって、上記糖混合物は、４〜９糖の糖類の含有量が上記糖混合物全量を基準として３５質量％以上であり、且つ、１０糖以上の糖類の含有量が上記糖混合物全量を基準として４５質量％以下である糖混合物であり、上記糖混合物の含有量が、上記水消去性水性インキ組成物全量を基準として５〜２０質量％である、水消去性水性インキ組成物。【選択図】なし