It is better to be careful when buying it because there is "This product is not completely covering data, it will not erase" in the manufacturer's catalog. As per the catalog, personal information could not be completely erased.
There was no case that my address could not be read no matter how many times it was pressed. Moreover, when tracing with an oil pen, the original letter will emerge. It can not be used for managing important personal information.
It will be easy to read the address when dry. It is the same even if you darken it by pressing it many times. Anyway, if you try to see it it will be easy to read and it will not be useful at all. Then, when you traced from above with an oil-based pen, just the original letter emerged. It was the worst because I noticed that 5 items were purchased and all were unusable after opening.