Table 2 Amount of calcite estimated by FT-IR and percentage of painting components evaluated in each Pompeian’s painting samples
Paint samples | Amount of paint powder weighed (μg/spot) | True paint (%) | Calcite (%) | Oxalate peak area/μg (780 cm−1) | Organic material (AA + FA) (%) | Pigment + other organic material + decay compounds (%) | ||
|---|---|---|---|---|---|---|---|---|
7.5 | 15 | 30 | ||||||
Amount of calcite measured in the paint powder (μg) | ||||||||
S1 | 5.71 | 6.95 | 61.8 | 38.20 | 61.8 | 0.52 | 0.88 | 37.32 |
S2 | 5.67 | 8.87 | 60.3 | 39.70 | 60.3 | 0.66 | 0.37 | 39.33 |
S3 | 5.27 | 9.73 | 59,0 | 41.0 | 59,0 | 0.68 | 0.31 | 40.69 |
S4 | 4.89 | 7.07 | 58.2 | 41.80 | 58.2 | 0.44 | 0.24 | 41.56 |
S5 | 2.95 | 10.77 | 56.0 | 44.0 | 56.0 | 0.57 | 0.73 | 43.27 |
Average | 4.90 | 8.68 | 59.06 | 40.94 | 59.06 | 0.57 | 0.506 | 40.42 |
SD | 1.14 | 1.66 | 2.19 | 2.19 | 2.19 | 0.099 | 0.28 | 2.25 |
CV% | 23.25 | 19.18 | 3.70 | 5.34 | 3.70 | 17.31 | 55.69 | 5.57 |