Blushing is virtue's colour.

The proverb presents a blush as a visible sign of moral sensitivity. Feeling embarrassed may suggest modesty or an awareness that something is improper.

It values the ability to feel shame rather than indifference to one's conduct. A blush is treated as a favorable sign, not as certain proof of good character.

Use it to speak kindly of someone who blushes after an awkward or improper moment, especially when their embarrassment suggests that they care about how they have behaved. It can also defend modesty against ridicule.