Figure 1 | Heritage Science

Figure 1

From: The sulfidation process of sterling silver in different corrosive environments: impact of the process on the surface films formed and consequences for the conservation-restoration community

Figure 1

Calculated colour change of Ag925 coupons exposed to residential and laboratory environments in comparison with a freshly polished Ag925 coupon. a Change in colour (ΔE) over time; b the colour as described by a* and b* values, indicating a more yellow (Residence environment) and a more reddish corrosion colour development (Laboratory environment); values with numbers 1–6 correspond to the exposure time in months as in a.

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