Database/Colorant/CI 15800
Mostly petroleum · ISO 16128

Is CI 15800 natural?

Mostly not. Only the calcium counter-ion is natural-origin; the azo-naphthol-carboxylate dye backbone is synthetic petrochemical.

INCI nameCI 15800
CAS6371-76-2
FormulaC34H22CaN4O6 · 622.6 Da
FunctionColorant
FeedstockCI 15800 is a synthetic monoazo pigment precipitated…

How we scored it

Calcium bis(diazo-naphthol carboxylate) lake pigment: Ca 40.08 Da / MW 622.6 Da = 0.064 natural (counter-ion only); the phenyldiazenyl-naphthalene-carboxylate backbone (petrochemical) is the remainder.
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

CI 15800 is a synthetic monoazo pigment precipitated as its calcium salt (a 'calcium lake'). The organic phenylazo-naphthol-carboxylate backbone is built from petrochemical aniline and naphthol intermediates; only the calcium counter-ion (about 6% of molecular mass) is natural-origin.

In plain English

A synthetic red pigment used as a calcium 'lake' colorant in cosmetics. Almost entirely built from petroleum-derived chemicals; only a small mineral (calcium) portion is natural.

CosIng definition: CI 15800 is classed chemically as a monoazo colour. It conforms to the formula:

Natural alternatives with the same function

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 Calcium Ferrite 100% natural origin

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 Calcium Stearate 100% natural origin

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Structure

2D structure of CI 15800

calcium bis(3-carboxy-1-phenyldiazenylnaphthalen-2-olate)

PubChem CID 135565537 ↗

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 15800. PubChem CID 135565537. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
  3. 3CI 15800. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  4. 4CI 15800. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CI%2015800