After synthetic dye phase-outs, how should a formulator build a clean-label colorant decision tree?
The fastest defensible sequence is: target shade → matrix conditions → regulatory status → cost-in-use → supplier documentation. For water-based red/pink, first compare beetroot red (E 162) and anthocyanins (E 163); for orange/yellow, compare beta-carotene (E 160a) and curcumin (E 100); for tomato-r
After synthetic dye phase-outs, how should a formulator build a clean-label colorant decision tree?
The fastest defensible sequence is: target shade → matrix conditions → regulatory status → cost-in-use → supplier documentation. For water-based red/pink, first compare beetroot red (E 162) and anthocyanins (E 163); for orange/yellow, compare beta-carotene (E 160a) and curcumin (E 100); for tomato-red to orange, evaluate lycopene (E 160d); for salmonid feed and supplement coloration, astaxanthin is E 161j in the EU and is exempt from certification for salmonid fish feed under 21 CFR 73.35, while EU human food use is limited to astaxanthin-rich oleoresin from Haematococcus pluvialis as a novel food with EFSA advising a maximum of 4 mg/day. Fermentation-derived carotenoids usually give tighter assay control and cleaner supply, but botanical extracts still win when label familiarity, local pricing, or a specific ingredient declaration is decisive.
Start with the five formulation checkpoints
Use these in order. They prevent a colorant choice that passes an R&D bench trial but fails regulatory, sensory, or supply review.
- Shade and hue. Match the target shade under the actual finished-product lighting. Natural pigments rarely produce the exact hue of a synthetic azo dye; they usually require a shift in spec or a supporting color blend.
- Matrix conditions. Check pH, water activity, fat/water phase, thermal processing, light exposure, and oxygen. Beetroot red and anthocyanins are best in low-pH aqueous systems; beta-carotene and lycopene are oil-soluble and usually require an emulsion for clear beverages.
- Regulatory route. Confirm the E-number or US color additive/GRAS route in each target market. Do not assume a pigment is globally usable because it is “natural.”
- Label driver. Decide whether the label must say a specific ingredient, such as “beetroot red,” “curcumin,” or “beta-carotene,” or whether an E-number declaration is acceptable.
- Cost-in-use and supply. Compare price per kilogram of active carotenoid, not per kilogram of raw material. Request assay, stability data, lead time, MOQ, and multi-batch COAs before committing.
Pigment shortlist by target shade
| Target shade | Common synthetic replacement need | Clean-label candidates | E-number | Main route | Key formulation notes |
|---|---|---|---|---|---|
| Red/pink in water-based foods | Certified red azo dyes | Beetroot red / betanin | E 162 | Botanical | pH-sensitive; heat and light sensitive; best in acidic aqueous formulations |
| Red/pink in acidic beverages | Certified red azo dyes | Anthocyanins from grape, black carrot, elderberry or purple sweet potato | E 163 | Botanical | Color shifts with pH; use in pH 3–5 range |
| Orange | Certified orange azo dyes | Beta-carotene | E 160a | Fermentation, algal, or botanical | Oil-dispersible; may need emulsification; good for margarine, bakery, oil-based systems |
| Yellow | Certified yellow azo dyes | Curcumin | E 100 | Botanical | Light-sensitive; strong yellow; turmeric flavor can require masking |
| Tomato red / red-orange | Certified red/orange dyes | Lycopene | E 160d | Tomato extraction or fungal fermentation | Oil-soluble; heat-stable in some matrices; confirm US route: tomato-derived is 21 CFR 73.585, fungal is not Part 73 |
| Pink/red-orange for fish feed | Synthetic astaxanthin or canthaxanthin | Astaxanthin | E 161j | Algal Haematococcus pluvialis, yeast fermentation, or non-food synthetic | EU salmonid feed and US salmonid fish feed both have specific routes; EU human food is only H. pluvialis novel food |
| Yellow-orange for supplements | Synthetic beta-carotene or tartrazine | Beta-carotene | E 160a | Fermentation or algal | Confirm assay and carrier; GRAS or food additive status depends on source |
| Green | Synthetic green blends | Chlorophylls and chlorophyllins | E 140 | Botanical | Green shade can be olive-toned; copper chlorophyllins have different solubility profiles |
Example specification table: fermentation-derived beta-carotene oil suspension
This is an indicative grade, not a quotation. Confirm all values against the supplier’s COA and the target-market food category.
| Parameter | Value |
|---|---|
| Product | Fermentation-derived beta-carotene oil suspension |
| E-number | E 160a |
| Source organism | Blakeslea trispora or equivalent fermentation strain; confirm supplier statement |
| Active assay | 10% beta-carotene typical; other concentrations available |
| Form | Liquid oil suspension |
| Carrier | Sunflower oil, MCT, or grade-specific carrier |
| Solubility | Oil-dispersible; emulsion required for aqueous systems |
| CAS number | 7235-40-7 |
| Use level | Formulation-dependent; confirm per food category and target shade |
| Storage | Cool, dry, nitrogen-flushed, protect from light |
| Shelf life | 12–24 months from production date, depending on packaging; confirm on COA |
| MOQ / lead time | On request; varies by grade, assay, and destination |
| Documentation | COA, heavy metals, residual solvents, allergen statement, stability data, regulatory dossier |
Fermentation, botanical and algal routes compared
| Carotenoid | Main production routes | EU regulatory position | US regulatory position | Cost anchor |
|---|---|---|---|---|
| Astaxanthin | Algal Haematococcus pluvialis, yeast fermentation, synthetic | E 161j as a color; EU human food use limited to H. pluvialis oleoresin under the novel food rules; synthetic astaxanthin is not permitted in EU food (Reg (EC) No 1925/2006) | Exempt from certification for salmonid fish feed under 21 CFR 73.35; food/supplement use rests on GRAS notifications | Published 2021 peer-reviewed anchors per kg of product: synthetic around USD 1,000, yeast around USD 2,500, algal around USD 7,000; depends on assay, form, volume, and market |
| Lutein | Marigold extract, fermentation | E 161b | No 21 CFR Part 73 listing; moves through GRAS notification route | Quote on request |
| Zeaxanthin | Marigold extract, fermentation | E 161h | No 21 CFR Part 73 listing; confirm GRAS or food-use route | Quote on request |
| Lycopene | Tomato extraction, fungal fermentation | E 160d | Tomato-derived lycopene is 21 CFR 73.585; fungal lycopene has no Part 73 listing | Quote on request |
| Beta-carotene | Fermentation, algal, botanical | E 160a | Food and supplement use depends on source and applicable GRAS or food additive status | Quote on request |
The fermentation route generally offers a controlled production environment, narrower assay variation, and supply that is less dependent on crop yield or weather. Botanical and algal routes can be simpler to explain on a label and may already be specified in existing customer recipes. The correct answer depends on which regulatory file, price point, and stability profile the final product requires.
Regulatory status
European Union
Color additives are regulated under Regulation (EC) No 1333/2008 and its amendments. The relevant E-numbers are:
- E 161j astaxanthin
- E 161b lutein
- E 161h zeaxanthin
- E 161g canthaxanthin
- E 160d lycopene
- E 160a carotenes / beta-carotene
- E 162 beetroot red / betanin
- E 163 anthocyanins
- E 100 curcumin
- E 140 chlorophylls and chlorophyllins
Astaxanthin has two EU tracks. As a color it is E 161j. As a human food ingredient, astaxanthin-rich oleoresin from Haematococcus pluvialis is on the Union list under Regulation (EU) 2015/2283 and Commission Implementing Regulation (EU) 2017/2470, as amended by 2024/1026. EFSA’s NDA Panel advises a maximum of 4 mg/day of astaxanthin from H. pluvialis, equivalent to 0.06 mg/kg bw/day at 70 kg. Do not label astaxanthin as E 162; E 162 is beetroot red.
United States
Astaxanthin is exempt from certification for salmonid fish feed under 21 CFR 73.35. Food and supplement use of astaxanthin rests on GRAS notifications. Lutein has no 21 CFR Part 73 listing; it moves through the GRAS notification route. Fungal lycopene has no Part 73 listing; tomato-derived lycopene is listed at 21 CFR 73.585. Avoid describing any of these as “FDA approved color additives.”
United States synthetic dye phase-out status
There is no single FDA synthetic dye phase-out deadline. The withdrawals of petroleum-derived color additives are proceeding case by case through individual Federal Register actions, proposals to remove specific listings, and petitions to revoke specific certificates. A formulator should check the exact final rule for the product category and compliance date in that rule, rather than assuming one global deadline.
Japan and Korea
Japan applies its own list of existing food additives and specification standards under the Food Sanitation Act. South Korea applies the MFDS Food Additives Code. For any given pigment, confirm the permitted source organism, additive name, maximum use level, and specification in the finished-food category. The answer is market-specific.
Frequently asked questions
Q: Which E-number replaces a synthetic red in a low-pH beverage? In the EU, the first shortlist is usually beetroot red (E 162) or anthocyanins (E 163). Both work best in acidic aqueous matrices, but the final shade and heat/light stability will differ by fruit or vegetable source and dosage.
Q: Is fermentation-derived astaxanthin allowed in EU human food? EU human food use is limited to astaxanthin-rich oleoresin from Haematococcus pluvialis under the novel food rules. A fermentation-derived astaxanthin grade must be confirmed as produced from that organism and must meet the 2024/1026 specification for monoester/diester share and 9-cis fraction before the formulator can use it in EU food.
Q: What is the price difference between algal and yeast astaxanthin? Published 2021 peer-reviewed anchors are around USD 7,000/kg of product for algal astaxanthin, around USD 2,500/kg for yeast astaxanthin, and around USD 1,000/kg for synthetic astaxanthin. These are indicative only; actual price depends on assay, form, volume, and market, and should be requested as a quote.
Q: Can lutein be used as a color additive in the US? Lutein has no 21 CFR Part 73 color additive listing. It moves through the GRAS notification route for food and supplement use. Do not describe it as an FDA-approved color additive in product documentation.
Q: How do I choose between beta-carotene and curcumin for a clean-label yellow? Choose beta-carotene when the matrix is oil-based, needs an orange-to-yellow hue, and can tolerate an oil-soluble or emulsified form. Choose curcumin when a bright yellow in an aqueous or low-fat product is needed, but account for light sensitivity and its characteristic turmeric taste.
Q: What should I request from a clean-label pigment supplier before reformulating? Request the certificate of analysis, source organism, E-number or regulatory route, active assay, carrier, heavy metals, residual solvents, allergen statement, stability data under your process conditions, and the regulatory dossier for the target market. Compare cost per kilogram of active carotenoid, not cost per kilogram of commercial product.
Conclusion
The clean-label reformulation decision tree is not a single pigment swap. It is a shade, matrix, regulatory, cost-in-use, and documentation sequence. Starting with that sequence reduces the risk of choosing a pigment that fails stability, label, or market-entry review. EarthHue supplies fermentation-derived natural carotenoids for food, beverage, nutraceutical, cosmetic, personal care, and pharmaceutical applications. For product specifications, technical data, or a quote, contact the technical team through https://earthhue.net/en/products and https://earthhue.net/en/contact.