3. Experimental Methods
- a Japanese tray (26 × 26 cm2), accessory of a two-level table imported from Japan at the end of the 19th century, depicting flowers and leaves (Figure 1a), with seven different colors: red, rose, brown, green, yellow, black and gold. Millimeter chips were taken from the reverse black side as well as from a companion black tray with a yellow lacquered rim.
- a non-representational artwork (30 × 39.5 cm2, 1961, Figure 1b) in the style of Ta Ty, a famous Vietnamese Painter (1922–2004), with eight different colors: red, green, light green, brown, yellow, white and gold.
- a portrait (15 × 20 cm2) from the beginning of the 1990s (Figure 1c), depicting the heroin from the famous Kim Vân Kiều novel by Nguyễn Du (1765–1820) with red, black and gold colors.The analyzed spots are indicated in Figure 1.Figure 3 (shows the lacquer paintings studied in the Collector’s rooms with the HE785 mobile Raman set-up:
- a Đinh Cường (1939-) artwork, depicting a woman playing violin (60 × 40 cm2) with red, black, green, blue, yellow, white and gold colors.
- an anonymous decorative lacquerware depicting flowers.
- a Senterra microspectrometer from Bruker Optics (Germany) equipped with a Peltier-cooled CCD matrix detector and with two laser sources (edge filtered Nd:YAG 532 nm and 785 nm diode).
- a RFS 100 s FT-Raman microscope III, also from Bruker Optics, equipped with a 1064 nm double Nd:YAG laser.
4.1. Lacquer Medium
|Artifact||Color||785 nm identified||1064 nm identified|
|Japanese tray||Red||HgS vermilion||HgS vermilion|
|Green||Prussian blue||Prussian blue|
|Brown||HgS vermilion||HgS vermilion|
|Ta Ty’s lacquerware||Red||Purpurine||Purpurine|
|White 1||Egg shell||Egg shell|
|Kim portrait||Red||HgS vermilion||HgS vermilion|
|Black||Carbon black||Carbon black|
4.3. Test with the Mobile Raman Set-up
Conflict of Interest
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