INVISIBLE ink has a lengthy history.
隐形墨水已经有一段历史了。
Think, think, think, think, invisible ink!
想，想，想，想，隐形墨水！
How do you tell when you run out of invisible ink?
要怎样才知道什么时候隐形墨水用完了？
the relevant part of the statement must be written in invisible ink.
声明中相关部分必须用隐形墨水书写。
"Appareo" is Latin for "appear" or "to become visible". Used to reveal invisible ink.
是拉丁文才“呈现”或者“现形”的意思，用来使得隐性墨水现形。
The collection also has files on UFOs, recipes for invisible ink and reports on research into telepathy.
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。
Other unusual records include a collection of reports on flying saucers, and the recipes for invisible ink.
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。
Invisible during the day, the taggers would come out at night to cover the city with ink and paint.
这些涂画者白天不见踪影，晚上就出来用墨水和油漆涂满整个城市。
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.
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。
Now the generally accepted method to handle and collect invisible fingerprints of sweat is by means of lime or ink powder.
提取汗潜指纹通常采用的方法是用灰粉或墨粉进行处理，但在渗透性材料上，如纸张、硬纸板等最合适的方法是采用碘熏法。
The fragments, preserved between sheets of glass, respond to the infra-red spectrum - ink invisible to the naked eye can be seen and photographed.
红外线谱把这些保存在玻璃板之间的残片上肉眼无法识别的墨迹显现出来，并拍成照片。
The fragments, preserved between sheets of glass, respond to the infra-red spectrum - ink invisible to the naked eye can be seen and photographed.
红外线谱把这些保存在玻璃板之间的残片上肉眼无法识别的墨迹显现出来，并拍成照片。
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