If it’s formulas you are worried about scratch them into something like the bottom of your shoe or a water bottle. Anything you can take into the test. Even if you can’t look at the bottom of your shoe maybe you could feel what the formula is.

Maybe you could use the inside of your shirt. Kind of stretch it like you have an itch but you have the formulas on the inside?

Up voting you and wishing you good luck. Would love an update with how it goes.