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| Characteristic IR Absorption Bands | ||||
Blue P. | Green p. | Red P. | Brown P. | Dark red P. | Yellow P. | White P. |
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3403.74 | 3413.39 | 3545.49 | 3403.74 | 3541.64 | 3402.78 | 3545.49 | O-H Stretching band 3600 - 3200 cm | ||
2512.79 | - | - | 2873.42 | 2854.13 | 2873.43 | - | C-H Stretching bands 3000 - 2800 cm | ||
1622.8 | 1624.73 | 1620.88 | - | 1621.84 | 1620.88 | 1620.88 | O-H Bending band 1650 cm | ||
1432.85 | 1430.92 | - | 1432.85 | 1445.39 | 1431.89 | - | C-H Bending band 1 480 - 1300 cm | ||
1142.39 | 1301.17 | 1142.62 | 1143.52 | 1116.58 | 1144.55 | 1142.62 | C-O Stretching band 1300 - 900 | ||
874.56 | 873.59 | 779.10 | 873.59 | 874.56 | 874.56 | 779.10 | O-C-O bending band of carbonate group of calcite. 900 - 650 cm | ||
670.14 | 694.24 | 670.14 | 670.14 | 671.10 | 670.14 | 670.14 | bending band of gypsum. 700 - 600 cm | ||