When melamine is present, the color of the solution changes from red to blue within seconds and can be measured both by visual inspection and spectrophotometry.
当存在三聚氰胺时，溶液的颜色将在几秒钟之内迅速从红色变为蓝色，而且能够同时通过肉眼观察和分光光度法检测到。
Study on natural ageing of blue ballpoint pen inks by ultraviolet-visual spectrophotometry;
建立了一种基于非水毛细管电泳法区分蓝色圆珠笔油墨的方法。
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