Characteristics

Crude oil

Filtered oil

on canvas

Filtered oil on activated activated carbon (3%)

Filtered oil

on activated carbon (5%)

Yellowing index

86.33^a ± 0.0067

86.46^a ± 0.26

79.04^a ± 0.0063

44.67^b ± 0.0067

Brown index

187.39^a ± 0.77

187.59^a ± 1.024

128.53^d ± 0.160

35.99^b ± 0.084

Clarity

95.25^a ± 0.045

94.99^b± 0.083

95.66^d ± 0.063

97.98^c ± 0.0033

Turbidity (NTU)

14.61^a ± 0.24

0.99^bc ± 0.43

0.08^d ± 0.013

0.033^d ± 0.0044