What does blueness doth express trueness mean?

"Blueness doth express trueness" suggests that the color blue symbolizes authenticity or sincerity. In various cultures and contexts, blue is often associated with calmness, trust, and reliability. Thus, the phrase implies that something characterized by blueness conveys a sense of genuine nature or honesty. It highlights the idea that certain qualities—in this case, represented by the color blue—can reflect deeper truths.