The printing surface is chemically treated for the reception of water in non-print areas and ink in print areas.
印刷纸张的表面经过化学处理，以便非印刷区域吸水，而印刷区域吸墨。
2
So this is a non-ink based print that disappears in a time frame that you can program, hours, days whatever.
这种非墨水打印的字,会在一段时间之后消失,时间长短由你随便控制。
3
When you see a TV detective turn a doorknob using a handkerchief, she's probably destroying a latent print. The only way not to corrupt a latent print on a non-porous surface is to not touch it.