Modern writing inks usually contain ferrous sulfate with a small amount of an acid; on paper they darken and bond becoming permanent.
现代写字用的墨水通常包括了硫酸亚铁和少量的酸；写在纸上，颜色会越来越深，且能保持永不褪色。
Printing ink, writing or drawing ink and other inks, whether or not concentrated or solid.
印刷油墨、书写或绘图墨水及其他墨类，不论是否固体或浓缩。
According to the principle of dialysis, writing time of different kinds of fountain pen inks on different types of papers were measured using newly researched and developed dialyzates.
本文通过最新研发的透析液，根据透析的原理，对书写在不同种类纸张上的不同种类的钢笔墨水字迹进行了书写时间测定。
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