The area of pigment sampled with the handheld XRF is marked with an asterisk in the middle of the red shoe.

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The area of pigment sampled with the handheld XRF is marked with an asterisk in the middle of the red shoe.

The area of pigment sampled with the handheld XRF is marked with an asterisk in the middle of the red shoe, approximately a 4x5mm oval. The resulting elemental spectrum is shown below with the peaks identified. Credit: Carolyn Burns