If you still notice a butterfly with its open wings, it absorbs light from the sun in order to raise its body temperature. Peacock butterflies use eye models on their wings to frighten predators. The wings are very delicate and often break, but still there should be a lot of damage to stop them from flying.
Wraps containing colored pigments can also blur in sunlight. If a butterfly looks pale it might be near the end of its life. Sometimes, color pigments can change and rare variations occur like copper wings with white wings instead of orange. There are often ultraviolet patterns in the wings that we can not see, but which may possibly be seen by other butterflies.