The "Operation Market Garden" set was a paradox. Its pristine paratroopers and gliders were packed in soil—coarse, grey sand labeled "Arnhem gravel." If removed, the figures would tarnish overnight, developing a dark, gritty patina.
A geologist examined the "gravel." It was pulverized concrete and brick from the Arnhem road bridge's ruins. More critically, it was ionized from the intense heat of the final battle.
This ionized particulate acted as a **corrosion catalyst**. When separated from the stabilizing minerals in their "native" soil, the metal alloy in the figures' joints oxidized
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