oil; painting; technique; experimental; reconstruction; artificial; ageing; restoration; material; compatative; microscope; study; analysis; instrumentation; natural; resin; varnish; diterpenoid; identification; behavior; triterpenoid; fresh; aged; copaiba; balsam; polymer; network; macromolecular; mobil; phase; stationary; additive; drier; composition; lipid; autoxidation; egg; tempera; protein; pigment; copper; green; glaze; indigo; easel; ldms; analysis; organic; asphalt; orpiment; deterioration; arsenic; sulphide; smalt; cadmium; secondary; ion; mass; spectrometry; cross; section; cross-section; conservation; wax; lining; application; drying; bituminous; mathematical; model; crack; pattern; regeneration; layer; paint; solvent; vapor; copaiva; clean; procedure; dosimetry; museum; environment; chemistry; spectroscopy; infrared; reflectography; spatial; ftir; ms; restoration