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The effects produced by the condensation of water vapours from the ambient inthe various intricate nanoarchitectures occurring in the wing scales of severalLepidoptera species were investigated by controlled cooling (from roomtemperature to -5 - -10 {\deg}C) combined with in situ measurement of changesin the reflectance spectra. It was determined that, due to this procedure, allphotonic nanoarchitectures giving a reflectance maximum in the visible rangeand having an open nanostructure exhibited alteration of the position of thereflectance maximum associated with the photonic nanoarchitectures. Thephotonic nanoarchitectures with a closed structure exhibited little to noalteration in colour. Similarly, control specimens coloured by pigments did notexhibit a colour change under the same conditions. Hence, this effect can beused to identify species with open photonic nanoarchitectures in their scales.For certain species, an almost complete disappearance of the reflectancemaximum was found. All specimens recovered their original colours followingwarming and drying. Cooling experiments using thin copper wires demonstratedthat colour alterations could be limited to a millimetre, or below. Driedmuseum specimens do not exhibit colour changes when cooled in the absence of aheat sink due to the low heat capacity of the wings.

Colour changes upon cooling of Lepidoptera scales containing photonic nanoarchitectures