She says they used different kinds of light to read hidden texts, and tested the material for dating.

她说他们使用不同种类的光来阅读隐藏的文本， 并测试了约会材料。

Once the scan had also revealed the topography of the sheet, with the location of folds and creases mapped, the resulting model could be virtually unfolded by a computer to reveal the hidden text.

扫描一旦显示出纸张的的形态，并标出褶皱和折痕的位置，那么可以通过计算机将得到的模型展开来揭示隐藏的文本。