According to the Independent, Swiss researchers have found that when old paper is used to make recycled cardboard, mineral oils in the printing ink may contaminate food stuffs packed inside it.

瑞士研究人员发现，用旧纸板做成的可循环利用的食品外包装，可能会污染到包装内部的食品。

youdao

Of course, now the real way to brand yourself as an independent thinker is to remain ink-free.

FORBES: Livestrong Tattoos, Kardashian Fashion, Brangelina Wine: Using a Celebrity Brand to Define Your Own