Chapter III · Structural Colour The Cabinet Ledger
Plate XIV

Pigment fades. Structure endures.

Across two centuries of cabinet specimens, only the Morpho's structural blue keeps its luminance.
0% 25 50 75 100 22% 31% 18% 27% 91% Swallowtail ochre Deep amber wash Vermilion brick Slate ground ink Morpho structural blue Retained luminance after ~200 years of cabinet storage, by colourant type (n = 318 mounted specimens).
Source: Conservation survey, hand-coloured copperplate folios, Amsterdam · 1734–present
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