id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_wv2nvn2pnrciffhqagw72nvhce	R. Arletti	Roman coloured and opaque glass: a chemical and spectroscopic study	2006	8	.pdf	application/pdf	4920	413	74	the colour and opacity of red and green opaque finds (mosaic tesserae, game counters, and glass artefacts) from Sicily edge XANES and EXAFS spectra suggest that, in red samples, copper is present as monovalent cations coordinated to the oxygen atoms of the glass framework, accompanied by metallic coloration is always produced by crystals of metallic copper dispersed in the glass matrix, the differences in the final Thus, red opaque glass can contain metallic copper TABLE 1 Glass chemical analyses obtained by WDS-EMPA for opaque (O.) and transparent (T.) samples, respectively EXAFS measurements were performed at 77 K in fluorescence mode on selected red RT7 and green PM35117 samples and on the reference compounds (metallic Cu, Cu2O, TABLE 2 Cu-K -edge feature positions (eV) for the glass samples and the reference compounds. FIGURE 4 Cu-K -edge XANES spectra for blue, green, and red glass samples, compared with those of reference compounds	./cache/work_wv2nvn2pnrciffhqagw72nvhce.pdf	./txt/work_wv2nvn2pnrciffhqagw72nvhce.txt