What is the powder on butterfly and moth wings made of?

The powder on butterfly and moth wings is made of tiny scales.

These scales are modified hairs attached to the wing membrane. They overlap like roof tiles and cover the wings and often parts of the body. When handled, they can detach easily, creating the familiar dust-like residue associated with butterfly wings.

Scales produce color in several ways. Some contain pigments that absorb particular wavelengths of light, while others have microscopic structures that reflect light through iridescence. Structural color helps create the brilliant blues of many morpho butterflies without requiring blue pigment.

The scales also contribute to camouflage, warning coloration, courtship signals, and temperature regulation. Losing some scales does not usually destroy a butterfly’s ability to fly, although extensive damage can affect flight and appearance. The old belief that touching a butterfly makes it permanently unable to fly is incorrect.