black watermark ink 黑水印油墨
With this so-called Watermark Ink writing, the chips could also serve as secret code devices.
随着所谓的水印墨水的应用，这种晶片也可以用作为秘密代码设备。
The security features of the former 10, 000 yen notes were the watermark, the use of ultrafine line printing, and luminescent ink.
前一版10000元钞票的防伪特征是水印、精细线条印刷和发光油墨。
Secondly, the fake tickets on the "China Railway" logo and watermark on the back are more vague, and the hand, slightly face, the ink may stick in the hand.
其次，假票上“中国铁路”标志以及背面的水印都较模糊，且用手轻揉票面时，油墨可能沾在手上。
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