M. Járó - L. Költő szerk.: Archaeometrical research in Hungary (Budapest, 1988)

Analysis - KRISTON László, JÁRÓ Márta: Impact of acid treatment of pigment samples from wall paintings on the result of paint identification by X-ray diffraction

The most characteristic "d" values of the white components and examined pigments Pigment ASTM card No. Characteristic d-values (nm) (relative intensity given in the index) Calcite 5-586 0304io 0.250! 0.229

10 0386, 0.2

10

2 O.I6O1 0.191

2 0.188

2 Aragonite 5-453 0340

10 0.248 3 0.198

7 0.188

3 0.327s 0.234

3 0.270s 0.237

4 Dolomite 11-78 0.289x0 0.202

2 0.219

3 0.139

2 0.179

3 0.267! 0.178

3 0.1

80

2 Gypsum 6-46 0.756

10 0.379

2 0.306

6 0.190

2 0.427s 0.2081 0.268

3 0.287

3 ct-quartz 5-490 0.334

10 0.228! 0.42Ő4 0.138! 0.182

2 0.213! 0.154

2 0.2461 Hematite (red ochre) 24-72 0.270 io 0.149

2 0.252

7 0.145

2 O.I7O4 0.221

2 0.369

3 0.184

3 Mercuric-sulphide (cinnabar) 6-256 0336

10 0.174

3 0.286io 0.168 a 0.198

4 0.177

2 0.317

3 0.207 3 Lead(II,III)-oxide (minium) 8-19 0338

10 0.311

2 0.290s 0.190

2 0.279s 0.183

2 0.263 3 0.176

3 Goethite (yellow ochre) 29-713 0.418 io 0.225

1 0.245 s 0.498

1 0.245 s 0.258i 0.172

2 0.219

2 Glauconite (green earth) 9-439 0.101

10 0.151

6 0.259

10 0363

4 0.453

8 0309

4 0333

6 0.240

6 Malachite 10-399 0.28 6

10 0.252

6 0369

9 0.278s 0.506

8 0.282

4 0.599

6 0.246

4 Calcium -cupric-silicate (Egyptian blue) 12-512 0329 io 0319s 0378

9 0.227s 0.300

9 0.763

4 0336

8 0.183

6 43. Tests and test results The results of the preliminary examination of the samples as well as those of the X-ray diffraction tests carried out before and after the acid treatment will be discussed according to the colours involved.