这种特殊的纸在打印前是蓝色的。当在打印过程中使用紫外线时,化学成分中的二氧化钛会失去电子,而这些电子之后会被普鲁士蓝所捕获。纸张大部分区域都会褪色,留下文字。
But the words on the paper are readable for a limited time only. After five days, the sheet of paper will have returned to its original blue colour and the words will be gone. The duration is even shorter if the paper is heated, even for only a few seconds.
但是这种纸张上的文字可阅读的时间是有限的。五天之后这张纸就会变成原来的蓝色,纸上的字也会消失不见。如果纸张被加热的话持续的时间就会更短,甚至只有几秒钟。
【双语:节约资源新招 可重复打印的纸】相关文章:
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