Black 7984

Black 7984^[1]

IUPAC name Tetrasodium 6-amino-4-hydroxy-3-[[7-sulfonato-4-[(4-sulfonatophenyl)azo]-1-naphthyl]azo]naphthalene-2,7-disulfonate
Other names Food Black 2 C.I. 27755
Identifiers
CAS number	2118-39-0^Y
EC number	218-326-9
Jmol-3D images	Image 1
SMILES [O-]S(C(C=C4)=CC=C4/N=N/C(C=C2)=C3C(C=C(S([O-])(=O)=O)C=C3)=C2/N=N/C1=C(S([O-])(=O)=O)C=C(C=C(S([O-])(=O)=O)C(N)=C5)C5=C1O)(=O)=O.[Na+].[Na+].[Na+].[Na+]
Properties
Molecular formula	C₂₆H₁₉N₅Na₄O₁₃S₄
Molar mass	733.69 g/mol
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Black 7984, Food Black 2, or C.I. 27755, is a brown-to-black synthetic diazo dye. It is often used as the tetrasodium salt.

When used as a food dye, it has E number E152. Its use in food is discontinued in USA and EU since 1984. It is also not permitted in Australia and Japan.

Black 7984 is also used in cosmetics.

Black 7984 may cause allergic or intolerance reactions, particularly amongst those with an aspirin intolerance. It is a histamine liberator, and may worsen the symptoms of asthma. It is one of the colorants that the Hyperactive Children's Support Group recommends be eliminated from the diet of children.

References

^ European chemical Substances Information System