Near-crater discoloration of white lead in wall paintings during laser induced breakdown spectroscopy analysis

被引：34

作者：

Bruder, R. ^{[1
]}

L'Hermite, D. ^{[1
]}

Semerok, A. ^{[1
]}

Salmon, L. ^{[1
]}

Detalle, V. ^{[2
]}

机构：

[1] CEA Saclay, DEN DANS DPC SCP LRSI, F-91191 Gif Sur Yvette, France

[2] LRMH, F-77420 Champs sur Marne, France

来源：

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY | 2007年 / 62卷 / 12期

关键词：

LIBS; wall paintings; discoloration; pigments; basic lead carbonate;

D O I：

10.1016/j.sab.2007.10.031

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

During Laser-Induced Breakdown Spectroscopy (LIBS) analysis of white lead pigment (basic lead carbonate, 2PbCO(3)center dot Pb(OH)(2)), used in wall paintings of historical interest, a yellow-brown discoloration has been observed around the crater. This phenomenon faded after a few days exposure tinder ambient atmosphere. It was established that the mechanism of this discoloration consists in lead oxides (PbO) formation. It was verified by further experiments under argon atmosphere that recombination of lead with oxygen in the plasma plume produces the oxides, which settle around the crater and induce this discoloration. The impact of discoloration on the artwork's aesthetic aspect and the role of atmosphere on discoloration attenuation are discussed. The mechanism is studied on three other pigments (malachite, Prussian blue and ultramarine blue) and threshold for discoloration occurrence is estimated. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1590 / 1596

页数：7

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