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

Analysis - WITTMANN Zsuzsa, BÉLAFI-RÉTI Katalin, DÉCSY Zoltán, ERDŐHALMI-TÖRÖK Klára, KISS—BENDEFY Márta, VASSÁNYI István, VELLEDITS Lajos: Examination of painting materials used by Mihály Munkácsy for his painting "Studio"

1000-, 43 57 X LS.OO B5 133 126 6B, SO U 174 161 i Û.QQ 100 150 200 250 rvc Fig. 7/a Mass spectrum of gum arabic different effects. The results of its hydrolysis are for example L-rhamnose C^H^Os (164), D-glucuronic acid C

6

H

12

0

7 (196), L-arabinose C

s

Hi

0

O

s (150) and D—galactose C

6

H

12

0

6 (180) [4]. We note that Gay [8] writes that gums were sometimes used as binding media for white lead. The 60-40%(w/w) of the sample could not be dissolved in chloroform. The organic material content (on the mass spectrum) of the insoluble part is 15-30 %(w/w). Under the conditions of the mass spectrometry measurement 25—30%(w/w) of the sample remained in the sample-holder. The infrared spectrum of the remainder of the sample (Fig. 8) shows the presence of esters bands at 1170 and 1744 cm-l (with long carbon chain) band at 1466 cm—

1) and aromatic compounds (band at 1632 cm—

1 wavenumber). The greater part of the remainder was inorganic material - on the basis of its elemental analyses (Table 2) — and the organic part was not more than 1—2 %(w/w) in the whole sample

. Table 2 The composition of the rest of the sample part not dissolved in chloroform after measuring by mass spectrometry Elements Amount Remarks %(w/w) Pb 30 Ca 7 Mg 4 80-90%(w/w) Zn 4 as inorganic compounds Si 5 Fe 4 O 3,5 about 10%(w/w) C 4,6 as organic compounds H 0,4