English translation: Double-sided Overprint (OP) Varnish
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Japanese to English translations [PRO] Tech/Engineering - Printing & Publishing
Japanese term or phrase:両面OPニス (ryoumenOPnisu)
Table of contents of a magazin called 印刷界 (insatsukai) under the item "Company reports" （企業ルポ）. The full expression is "両面OPニス引きのワンパス実現" (ryoumenOPnisu hiki no wanpasu jitusgen)." whereby ワンパス＝機械に１回だけ通すこと。