Database/Colorant/CI 27755
Half & half · ISO 16128

Is CI 27755 natural?

Half and half. Synthetic disazo naphthalene colorant supplied as its sodium sulfonate salt. The sulfonate groups and sodium ions count as natural under the site's counter-ion convention; every carbon in the dye is petrochemical.

INCI nameCI 27755
CAS2118-39-0
FormulaC26H15N5Na4O13S4 · 825.7 Da
FunctionColorant
FeedstockPetrochemical aromatic intermediates coupled into the dye, sulfonated…

How we scored it

CI 27755 C26H15N5Na4O13S4 825.6 Da: 4×SO3 320.2 Da + 4×Na 92.0 Da are mineral-derived (natural) = 412.2 Da; the disazo naphthalene chromophore 413.4 Da is petrochemical → 412.2/825.6 = 0.50. Same counter-ion convention as CI 16185 and the site's other sulfonated colorants.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Petrochemical aromatic intermediates coupled into the dye, sulfonated with sulfur trioxide and isolated as the sodium salt.

In plain English

A synthetic dark colourant used in cosmetics, made in a factory from man-made aromatic chemicals. It has no plant or mineral origin.

CosIng definition: CI 27755 is classed chemically as a disazo colour. It conforms to the formula:

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Structure

2D structure of CI 27755

tetrasodium;6-amino-4-hydroxy-3-[[7-sulfonato-4-[(4-sulfonatophenyl)diazenyl]naphthalen-1-yl]diazenyl]naphthalene-2,7-disulfonate

PubChem CID 136075847 ↗

References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2CI 27755. PubChem CID 136075847. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 27755. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 27755. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2027755