If I'm looking for consistent color in narrative film across different shotcomps, does it make more sense to aim my camera at a WB card and set the WB in-camera (which will change the Kelvin temperature each time for each setup), or, would it be better for consistency across multiple shots/lighting setups, to set the WB to the color temp of the lights I'm using (5600K, daylight) for the in-camera WB, and then set the WB in post, by using the WB eyedropper, clicking on the same gray card recorded in frame, used w/ different lighting setups?

Do the cards have the same finish (matte or glossy) on each side? Which cards have what finish, and how do I know when to use matte or glossy? ...I'm shooting and doing WB for a greenscreen headshot interview

how large is large.?

Are these cards waterproof? I'd like to take them diving.

is the surface glossy/satin or matte?

If I'm filming the WB cards and then using WB selector/eyedropper in post (in premiere pro), should I use the Gray card or the White Card with the eyedropper tool? Feels weird using a gray card for WB. Looking for consistent colors across multiple takes

What percent black are the 3 cards?

Are the cards rigid or floppy? Do they bend when held up by the subject, or do they remain flat/taught?