阅读说明：本技术 用于制备具有可变颜色的水性凝胶油墨的方法和其水性凝胶油墨 (Method for preparing aqueous gel ink with variable color and aqueous gel ink thereof ) 是由 K·穆金 F·吉拉尔 A·斯潘根伯格 R·梅蒂隆 O·奥尔本 于 2019-11-18 设计创作，主要内容包括：本发明涉及一种用于原位制备具有可变颜色的水性凝胶油墨的方法,所述方法包括以下步骤：(i)制备包括还原剂的基于凝胶的水性油墨基质,(ii)加入金属盐溶液,(iii)加入铁粉以获得具有可变颜色的水性凝胶油墨,其中步骤(ii)和(iii)可以互换。本发明还涉及一种根据本发明的方法获得的具有可变颜色的水性凝胶油墨,所述水性凝胶油墨包括还原剂、金属纳米颗粒和铁粉。最后,本发明涉及一种书写工具,所述书写工具包括根据本发明的具有可变颜色的水性凝胶油墨。(The present invention relates to a method for the in situ preparation of an aqueous gel ink with variable colour, comprising the steps of: (i) preparing a gel-based aqueous ink base comprising a reducing agent, (ii) adding a metal salt solution, (iii) adding iron powder to obtain an aqueous gel ink having a variable color, wherein steps (ii) and (iii) are interchangeable. The invention also relates to an aqueous gel ink with variable colour obtained according to the method of the invention, comprising a reducing agent, metal nanoparticles and iron powder. Finally, the invention relates to a writing instrument comprising the aqueous gel ink with variable colour according to the invention.)