Objective To study the visualizing conditions of the obliterated writing covered by the same class and color inks using a video spectral comparator.
目的研究运用文检仪显现同种同色掩盖字迹的显出条件。
Pastel remains on the surface of the paper and thus can be easily obliterated unless protected by glass or a fixative spray of glue size or gum solution.
色粉浮在纸上，如果不加玻璃或喷胶防护就很易擦掉。
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