(3) the addition of the dilution in printing ink, in reducing solvent ink viscosity, ink concentrations.
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ink concentrations
油墨浓度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In places, the ink from the original text is no more than a faint stain, so the scientists studying it need a technique that is sensitive to very low concentrations of ink.
在有些地方原文的墨迹只剩下些微印痕，这使得研究它的科学家需要用能识别超低浓度的墨迹的技术。
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