Ponceau 4R E124
synthetic — Primarily synthetic.
Trisodium (4E)-3-oxo-4-[(4-sulfonatonaphthalen-1-yl)hydrazinylidene]naphthalene-2,7-disulfonate
CAS: 2611-82-7
Factual Regulatory Reference
This database provides factual regulatory information compiled from official government sources. It does not constitute medical, nutritional, or safety advice. Regulatory status varies by country and is subject to change. Always refer to your local regulatory authority for the most current information.
? Did You Know?
Beyond food, Ponceau 4R is also used in cosmetics, medicine, industrial applications. Its versatility makes it one of the most multi-purpose chemical compounds in everyday life.
Regulatory opinions differ: Ponceau 4R is approved in EU, JAPAN but banned in USA, CANADA. This reflects different risk assessment philosophies between regions.
To reach the Acceptable Daily Intake limit, a 60kg adult would need to consume approximately ~0.84 litres of flavoured drink (at 50mg/kg) in a single day. (This is a mathematical illustration, not a safety recommendation.)
Regulatory Analysis
The regulatory split on E124 reveals a fundamental disagreement about how to weight animal carcinogenicity data against epidemiological uncertainty. The FDA treats the animal evidence as dispositive and refuses authorization, while EFSA acknowledges the same studies yet opts for an 82% ADI reduction and mandatory warning labels rather than a ban. This divergence is compounded by the Southampton hyperactivity findings, where the EU chose behavioral warnings over prohibition -- a policy instrument that effectively delegates the risk decision to consumers and parents rather than resolving the underlying scientific dispute.
Detailed Regulatory Assessment
European Union (EFSA)
Must carry warning: 'May have an adverse effect on activity and attention in children' (since 2010); Southampton Six member
Official EFSA LinkUnited States (FDA)
Never authorized; FDA considers it carcinogenic
Japan (MHLW)
Approved as synthetic colour with purity specifications
Acceptable Daily Intake (ADI)
International Standard (JECFA)
mg/kg body weight per day
European Standard (EFSA)
Everyday Perspective
For a 60kg adult, this limit is roughly equivalent to consuming:
Natural Occurrence
This additive is not known to occur naturally in significant quantities.
Manufacturing
Naphthionic acid (1-amino-4-naphthalenesulfonic acid) is diazotized using sodium nitrite in hydrochloric acid at 0-5°C. The resulting diazonium salt couples with G-acid (2-naphthol-6,8-disulfonic acid) in alkaline medium (pH 9-10) via electrophilic aromatic substitution. The product is purified, salted out with sodium chloride, and converted to the trisodium salt form.
Applications Beyond Food
Limited use in some regions (EU, Japan, China compliant)
Tablet and capsule coatings
Textile and leather dyeing