Get the right colored tape.
Here’s a fun story. So, I was going to the local film supply store the day before a shoot. I had a few items to pick up, but among them was black gaffer’s tape.
I go in the store, in a rush as usual, and grab some tape. Later that night on set I realize I accidentally grabbed this:
When I should have got this:
When you’re working with a completely black background, things like that stand out. And because I have always needed black tape, and never dark blue, I am still stuck with the same roll. I guess the best lesson is don’t be in a hurry when buying color-specific tape.