At least in germany its prohibited to use them for specific foods. And its not allowed to advertise with things that are required by law. So advertising 'no colors and preservatives' wouldn't be allowed for some products.
This is true. Once I moved to the francosphere, I could only perceive colours and preservatives that are present, so there is no reason to tell me about colours and preservatives that are not present.
Thank you. As soon as I went to Google I got distracted and ended up wasting my time on something else. Following internetiquette I'll regard what you wrote as universal fact and won't look back on the matter.