Engraving lasers do not use ink, leave a permanent mark and are generally good for the environment.
激光雕刻不使用油墨，留下永久的标记，一般对环境有益。
Thermography: An imitation of "copper plate engraving" in which a raised image is obtained by printing with a very sticky ink or varnish.
烫凸：是一种仿效“铜版凹印”的方法。先用粘度高的油墨施印。
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