ElI5: Why a pen sometimes refuses to write on a specific part of the paper but works perfectly fine everywhere else?

Question

ElI5: Why a pen sometimes refuses to write on a specific part of the paper but works perfectly fine everywhere else?

In: Other

Answer 1

Skin oils, more often than not. Your hands/fingers/arm have pressed into the paper on that spot, making it difficult for the ink to bond to the paper. You’ll get this a lot using Post-Its if you pull the sheet off first, stick it to the table/desk top, and then start writing. You’ll notice where you ran your finger across the top of the Post-It to help it adhere to the table/desk top is the space where you have a difficult time writing.