Ink Eraser

Japanese: インキ消し - いんきけし
Ink Eraser

Used to erase ink writing. There are two types: for water-soluble ink and for oil-soluble ink. For water-soluble ink, there are one-component and two-component types. The one-component type uses only a solution of bleaching powder to decolorize, while the two-component type also uses oxalic acid as a main ingredient, which reduces organic lakes such as ferric tannate to ferrous iron, making them colorless. To distinguish between the first and second components, the second component is usually a pale red color. Dye ink can be erased with the first component, but the two-component type is used to erase blue-black ink. Oil-soluble ink erasers are marking pen type, and are permeated with a solvent for oil-soluble ink. They are used to erase writing by rubbing the writing surface, but while they can erase writing on impermeable surfaces, they are difficult to erase writing on permeable surfaces.

[Matsuo Nozawa]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

インキで書いた字などを消すもの。水溶性インキ用と油溶性インキ用がある。水溶性インキ用には一液式と二液式があり、一液式はさらし粉の水溶液だけで脱色し、二液式はそのほかにタンニン酸第二鉄などの有機レーキを第一鉄に還元して無色にするシュウ酸を主原料としている。なお、第1液と第2液を区分するため、通常第2液は淡い赤色にしてある。染料インキは第1液で消せるが、ブルーブラック・インキを消すときは二液式を用いる。油溶性用インキ消しはマーキングペンタイプになっていて、中に油溶性インキの溶剤を浸透させてある。それで筆記面をこすって消すが、不浸透面に書かれたものは消せても、浸透面に書かれたものは消えにくい。

[野沢松男]

出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例

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