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Varnish is made from the rosin ester or rosin modified phenolic resin and reaction with mineral oil, vegetable oils and other additives (such as gelling agent and chelating agent). 油墨連接料樹脂（俗稱軟樹脂）主要由松香酯或松香改性酚醛樹脂、礦物油溶劑、植物油及其它添加劑（凝膠化劑、螯合劑等）反應(yīng)而成。