Table 1 Overview of the w_HC/(w_HC+ w_C) ratios for every layer (or set of layers) analyzed with μ-XRPD, MA-tXRPD (transmission), and MA-rXRPD (reflection).

For MA-XRPD, an error of ±2σ is used; for μ-XRPD, a relative uncertainty value of ±10% is cited (see Materials and Methods).

Area	Technique	Layer(s)	w_HC/(w_HC + w_C)
Bright flesh tones	μ-XRPD	Upper (a₃)	0.65 ± 0.07
		Lower (a₄)	0.79 ± 0.08
		Ground (b₁)	—
	MA-tXRPD	All layers	0.75 ± 0.05
	MA-rXRPD	Superficial	0.65 ± 0.06
Shadow flesh tones	μ-XRPD	Upper (a₁)	0.48 ± 0.05
		Lower (a₂)	—
		Ground (b₂)	0.83 ± 0.08
	MA-tXRPD	All layers	0.82 ± 0.06
	MA-rXRPD	Superficial	0.37 ± 0.20
Background	MA-tXRPD	All layers	0.88 ± 0.04
Background	MA-rXRPD	Superficial	0.37 ± 0.20