Common name
CI name
CI number
λ
max
(nm)
Formulae
Dimethyl yellow
Solvent Yellow 2
11020
411
C
14
H
15
N
3
Sudan I
Solvent Yellow 14
12055
476
C
16
H
12
N
2
O
Sudan II
Solvent Orange 7
12140
490
C
18
H
16
N
2
O
Sudan III
Solvent Red 23
26100
504
C
22
H
16
N
4
O
Sudan IV
Solvent Red 24
26105
514
C
24
H
20
N
4
O
Table 1:
Common names, CI (Color Index) names, CI numbers, λ
max
and formulae of the standard synthetic fat soluble dyes studied.
