Characteristic IR Absorption Bands

Blue P.

Green p.

Red P.

Brown P.

Dark red P.

Yellow P.

White P.

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