Red is a primary color and cannot be produced by mixing other colors. Red, blue and yellow are the three primary colors. Only secondary and tertiary colors can be fabricated by mixing the appropriate colors together.
A fact is a piece of information that can be strictly defined and proved true. An opinion is a statement that expresses a belief, value, or feeling. An opinion cannot be proved true or false. For example, a person's age is a fact, but if someone is asked how old they feel, it is impossible to prove the person's answer to be true or false.
There is a feeling of the writer or speaker being outside of the information, and when they present it they do so without taking a stance or expressing their feelings in relation to that information. Generally speaking, it comes down to the difference between fact (objective) and opinion (subjective). Objective information has the ability to be counted or described. Subjective information on the other hand can consist of statements of judgment, assumption, belief, suspicion, or rumor.