Photography
As shocking as it may sound, you may want to ask your potential photographer if they will be shooting your wedding with a digital camera or one with film. Camera film is normally coated in gelatin, which is why you want a photographer and videographer who strictly works with digital.
I know you must be thinking “Uhm…. It’s 2019 everything is digital,” but you will be surprised that there are still wedding photographers that will still shoot with film.