Butterfly scales

 The butterfly caterpillar’s dust

Fig. 27. The butterfly caterpillar’s dust lies on wings like tiles on a roof. The individual scales are flat, have sharp edges and a thin stem that easily breaks. (ci.Am.)

Adult butterflies dust may cause allergic reactions. The dust is small scales, which give the wings color and gloss. The scales are converted hairs that easily break off and float in the air. People, who work in areas where butterflies are bred, or where there are many moths, often suffer from asthma and eczema caused by butterfly scales that are inhaled or gets into contact with the skin.