Use of Color

Understanding WCAG2.0

The meaning of information is not provided only by the color of the element.

Examples of NG are "Required items are red", "Red letters are errors", etc. If you carefully check 1.3.1, it will be almost satisfied items.

Principle Perceivable Information and user interface components must be presentable to users in ways they can perceive.
Guideline Distinguishable Make it easier for users to see and hear content including separating foreground from background.
Criterion Use of Color
(1.4.1 A)
Color is not the only visual means for conveying information, indicating motion, stimulating reactions or discriminating visual elements.

URL of Techniques for WCAG 2.0