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For example, ultraviolet. This way, by chance, no one will be able to see what you wrote, because the text in the booklet will be colorless under normal lighting.
Don't bank on that method because you won't be the only one who knows or understands how to use an ultraviolet ray to decode stuff on papers. My idea of masking secret words/stuff is to make them look as ordinary as possible.
This method, proposed by me, is certainly not universal. In some cases this is acceptable, in others there are other options, such as yours. To see the text with the help of ultraviolet, written with such a "
spy" marker, you need to know exactly where to look for it. But what if you don’t have a couple of booklets at home, but a whole home library? Searching through all the books will take a lot of time if you don't know in which book and on which page the seed-phrase or any other password is written. This is much better than keeping recovery phrase in a notepad on your computer desk.
It's the same method local men in Africa who carry huge cash around use. They appear unkempt and unassuming when ferrying cash across in a way that even robbers are likely to miss them on the road.
If they knew about the existence of bitcoin, they would transfer money in a faster and easier way.
