Take a picture from only the half of the paper and post it here, no one can help you based on speculations, we need to see what you are up against.
I said we, not that I am an expert or anything, figure speech.
Sorry, but for security reasons I will not post any images. I have tried a mini microscope, increasing resolution, sharpness, and all the other stuff and I can't see anything. I know for sure that this is a WIF prvkey with 51 symbols as it starts with 5.
It is all your choice, if actually you tried mini microscope and you could not discover anything, what other privacy issues are we talking about in an issue that cannot be viewed. Even if it could be readable, the pixels will reduce when captured with a camera.
Meanwhile, many people here think it's a seed phrase not knowing it's a long string of alphabets and numbers.