noun
watermarking (paper)
Refers to the process of embedding a design or pattern into paper during its production, visible when held to light.
この紙幣には高度なすき入れ技術が使われている。
Advanced watermarking technology is used in this banknote.
透かし is the more common word for watermark, while 漉き入れ specifically refers to the papermaking process of embedding the watermark.
Compound of 漉き (suki, 'papermaking', continuative form of 漉く) and 入れ (ire, 'putting in', continuative form of 入れる).