You're right, and I was simplifying. The problem isn't margarine per se, it's cheap margarine. Which is what you'll find in nearly all supermarket croissants. E

You're right, and I was simplifying. The problem isn't margarine per se, it's cheap margarine. Which is what you'll find in nearly all supermarket croissants. Even the ones advertising "all butter" in a supermarket will be using the shittiest butter that they're still legally allowed to call butter. Depends on the country but often has additives like food coloring and artificial butter flavor.