Margerine is frankenbutter- my mom used to say it is only a couple ingredients short of being plastic...
That’s sort of a myth, that margarine contains things similar to plastic. But you could make plastic out of the vegetable oil that margarine contains. It would just be a different process.
And margarine isn’t really yellow. When it first came out, the dairy industry wouldn’t let the whitish color of margarine be changed to look like butter so yellowing was stirred into it by the cook at home.