Decorative 18th Century Blue-and-White Portuguese Tile Panels: A Type-Case of Environmental Degradation

Table 1

WDXRF elemental data with reference to the glaze.

Element	2θ°	White area	Stained area
Background	134.0	900	919
𝐊^∗  Kβ	118.5	9 062	8 466
𝐒𝐧^#  Lβ	114.4	4 836	5 582
𝐂𝐚^∗  Kα	113.1	21 692	17 662
Ti  Kα	86.14	897	857
Background	84.00	257	273
Fe  Kα	57.52	64 669	64 511
Zn  Kα	41.80	7 643	7 668
As  Kα +  𝐏𝐛^#  Lα	34.00	148 213	160 001
As  Kβ	30.45	3 764	3 756
𝐏𝐛^#  Lγ	24.07	17 200	17 479
Background	21.50	2 794	2 710

∗Decrease.
^#Increase.