I understand. I did end up putting some dark foam (like a prefilter for a lawn mower) around the paper element causing the white of it to disappear. Here is what that looks like in case you or anyone else wants to go that route:

https://www.dropbox.com/s/zb02tm1838ub488/TF%20aircleaner%20FOAM%201.jpg?dl=0

https://www.dropbox.com/s/kj1up3rsb3r8gc0/TF%20aircleaner%20FOAM%202.jpg?dl=0