Leather helmet waxy growth

Waxy growth emerging from the grain of the leather.
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Figure 5: Waxy growth emerging from the grain of the leather. (a): Leather helmet, proper left side. (b): Detail of waxy segments in the chinstrap buckle region. (c): X-radiographic image of chinstrap buckle region. (d): Detail of waxy growth near the leather loop. (e): Photomicrograph details of waxy growth, showing a segmented structure.