隐形墨水已经有一段历史了。
声明中相关部分必须用隐形墨水书写。
the relevant part of the statement must be written in invisible ink.
想，想，想，想，隐形墨水！
要怎样才知道什么时候隐形墨水用完了？
后来，隐形墨水被用来在信使背上书写信息。
其他不同寻常的记录还包括一系列飞碟目击报告，以及隐形墨水的配方。
Other unusual records include a collection of reports on flying saucers, and the recipes for invisible ink.
档案中还涉及ufo、隐形墨水配方以及心灵感应研究报告等相关资料。
The collection also has files on UFOs, recipes for invisible ink and reports on research into telepathy.
幸运的是，萨姆和我还有一些时间，经过一番思考后，我们改变了主意，从一个超能机器转为做一个隐形墨水制码解码机。
Luckily, Sam and I still had some time. After more thought, we switched our idea from a superhero machine to an invisible-ink-maker-and-decoder machine.
严格来说，Grzybowski博士的发明与其说是可以隐形的墨水，不如说是自动清除字迹的纸张。
Strictly speaking, his invention is not so much self-erasing ink as self-erasing paper.
严格来说，Grzybowski博士的发明与其说是可以隐形的墨水，不如说是自动清除字迹的纸张。
Strictly speaking, his invention is not so much self-erasing ink as self-erasing paper.
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