I understand what you're going for, and it would be helpful as a consumer. I work for a food manufacturer, and speaking only for myself as an industrial engine

I understand what you're going for, and it would be helpful as a consumer. I work for a food manufacturer, and speaking only for myself as an industrial engineer, it'd be a pain to have a handful of colors added to every ingredient statement. Each color is another thing that can go wrong in manufacturing, and that quality needs to be checked against. Depending on packaging type, you might see branding slowly tend towards whatever standard colors simply because it'd simplify the packaging printing and could reduce the cost.