Blue 1 is a chemical compound, a dye mainly used in cosmetics and is better known by the name Acid Blue 9, CI 42090  or Brilliant Blue FCF.

Cosmetics

It was admitted to the list of authorised colourants in cosmetic products by Directive 76/768/ECC.

It is used as a direct colouring agent in hair colouring products. Its concentration in the finished cosmetic product must not exceed 0.5%. It is also subject to cosmetic restrictions IV/63 and III/190.

Food

In the food industry, it is included in the list of colouring food additives under the number E133. In 1970 FAO/WHO Expert Committee on Food Additives established an acceptable daily intake (ADI) of 0-12.5 mg/kg body weight. The Scientific Committee on Food of the EEC recommended an ADI of 10 mg/kg body weight in 1983.

CI 42090 Acid Blue 9 studies

• 
  Molecular Formula: C₃₇H₄₂N₄O₉S₃
• Molecular Weight: 782.942 g/mol
• UNII: 86R7G3C26F
• CAS: 2650-18-2  1334-07-2  29519-65-1  37307-55-4  37307-56-5  37307-78-1  51609-24-6  55819-29-9  86924-52-9  99149-43-6  511534-54-6
• EC Number: 220-168-0  223-339-8
• PubChem Substance ID 329769043
• MDL number MFCD00012141
• Colour Index Number 42090

Synonyms:

• Erioglaucine A
• Acid Blue 9
• C.I. Acid Blue 9
• Erioglaucine
• E133
• Kiton Pure Blue L
• Pro-Jet Blue OAM
• Erioglaucine (VAN)
• Daiwa Blue 109H
• Japan Blue 205
• Eriosky Blue
• Amacid Blue FG Conc
• Duasyn Acid Blue AE
• Orient Water Blue 9
• Schultz No. 770
• Caswell No. 007A
• CI Direct Brown 78
• Edicol Supra Blue E6
• Vitasyn Blue AE 85
• AF Blue No. 1
• Alphazurine (indicator)
• Xylene Blue VSG
• Acid Sky Blue A
• Alphazurine FG
• Erioglaucine E
• Alphazurine FGND
• Neptune Blue WF
• Fenazo Blue XR
• Patent Blue AE
• Calcocid Blue EG
• Kiton Blue AR
• Neptune Blue BRA
• Patent Blue 2Y
• Tortrazine C extra
• Calcocid Blue 2G
• Water Blue 9
• Bucacid Azure Blue
• Hidacid Azure Blue
• Acid Blue AE-SF
• Bleu Brilliant FCF
• Brilliant Blue Lake
• Aizen Brilliant Blue FCF
• Maple Brilliant Blue FCF
• C.I. Direct Brown 78
• Triantine Light Brown 3RN
• Acilan Turquoise Blue AE
• Peacock Blue X-1756
• CI ACID BLUE 9
• CI Acid Blue 9, diammonium salt
• D and C Blue No. 4
• Duasyn Acid Blue AE-SF
• A.F. Blue No. 1
• C.I. Acid Blue 9, diammonium salt
• Dolkwal Brilliant Blue