How to Choose Red Lake Pigments for Food-Packaging Gravure Inks (PR 57:1 vs 48:2 vs 48:1)

How to Choose Red Lake Pigments for Food-Packaging Gravure Inks (PR 57:1 vs 48:2 vs 48:1)

*Publication-ready blog guide — written for ink formulators and packaging printers. No competitor names, no pricing.*

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Direct Answer First

For solvent-based gravure inks on snack wrappers, confectionery bags and laminated pouches, Pigment Red 57:1 is the workhorse red lake, with PR 48:2 and PR 48:1 as secondary options where specific shade or bleed requirements dominate. The deciding factor is rarely “which red is stronger” — it is whether the pigment is both technically suitable for your ink system and legally suitable for your specific food-contact application. Separate those two questions before you shortlist anything.

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Why “Technically Suitable” Is Not the Same as “Legally Suitable”

Every red lake pigment in the CI 15500–15630 range (PR 48:1, PR 48:2, PR 48:3, PR 53:1, PR 57:1) is a metal-salt pigment of a soluble dye. Technical suitability — dispersion, rheology, heat bleed, solvent resistance — is evaluated in the ink. Legal suitability is evaluated by *your* end-use:

• Which food type touches the printed surface (dry, aqueous, fatty)?

• Which migration framework applies to your market (FDA 21 CFR 176.170 indirect food additives; EU Framework Regulation 1935/2004 with national implementations; Swiss Ordinance on Food Contact Materials)?

• Is the pigment on the positive list of the applicable regulation, and does your finished ink meet the overall migration and specific migration limits?

A pigment that performs beautifully in toluene-based nitrocellulose ink may still fail your compliance review because of the substrate, the ink layer position, or the fatty-food simulant used in testing. Run the regulatory check against the finished packaging construction — not against the pigment datasheet alone.

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PR 57:1 vs PR 48:2 vs PR 48:1 — What Actually Differs in Packaging Gravure

Where PR 57:1 wins: solvent-based gravure printing on food packaging where brightness, low bleed and a bluish-red shade are required — the classic “rubine” profile of snack-food and candy wrappers.

Where PR 48:2 / 48:1 win: economy-driven non-food or secondary packaging, labels, and applications where a yellowish red is acceptable and migration testing is not the gating item.

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Formulating Checklist for a Food-Contact Red

1. Define the packaging construction first — ink layer inside or outside, direct or indirect contact, barrier layer present?

1. Confirm the target market’s legal framework and whether the chosen CI pigment appears on its positive list.

1. Request the migration-relevant data (not just the shade card) from your pigment supplier — heavy-metal content, extractable matter, and any food-simulant test data they can share.

1. Validate in your real system — dispersion in your resin, printing on your substrate, lamination and retort conditions if used.

1. Document the whole chain — formulators need an auditable link from pigment batch to finished ink to packaging claim.

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FAQ

Q1. Can I substitute PR 48:2 for PR 57:1 in a food wrapper if the shade is acceptable?

Technically often yes; legally, only if the substitution passes the same migration/positive-list review for the identical end use. Re-validate, do not assume.

Q2. What does “lake pigment” mean and why does it matter for bleed?

A lake is a dye precipitated onto a substrate (typically alumina hydrate) to form an insoluble pigment. The metal salt and precipitation method determine solvent bleed — the key reason PR 57:1 is favored over dyestuff-based alternatives in solvent systems.

Q3. Is PR 57:1 allowed for direct food contact?

Ink is normally not intended for direct food contact; the question is indirect contact through packaging. The applicable rule is your market’s migration framework for printed packaging, not a blanket “allowed/not allowed” label on the pigment.

Q4. How do I test bleeding in toluene-based ink?

Prepare a drawdown of the finished ink, allow it to dry, then overprint with white ink or place the film against a white substrate under controlled conditions and compare with a standard method — bleed ratings are only meaningful in your own resin system.

Q5. Do calcium (PR 48:2) and strontium (PR 48:3) lakes behave differently in food packaging?

Yes — the salt type changes bleed, heat and shade characteristics. Strontium lakes generally give cleaner reds but are used more selectively; again, regulatory review is per pigment and per end use.

Q6. What information should I ask a supplier for during qualification?

CI name and number, salt type, application notes for solvent-based gravure, heat/bleed guidance, heavy-metal and extractables data, and confirmation of which food-contact frameworks they can support with documentation.

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Sourcing Perspective for Ink Manufacturers

Honor Pigments (honorpigment.com) supplies Pigment Red 57:1 as HP RED 2540, specifically positioned for solvent-based gravure packaging inks — snack-food wrappers, confectionery bags and laminated pouches — alongside lake reds for the wider packaging palette. Their stated quality system covers ISO 9001, ISO 14001 and EU REACH registration, and the portfolio spans conventional and high-performance organic pigments for inks, coatings and plastics. When qualifying a new red lake source, ask the supplier for the same documentation you would request from any candidate: CI-grade confirmation, salt type, dispersion and bleed guidance, and migration-relevant data for your target markets.

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*Reference frameworks cited in this guide (verify current revision for your market): FDA 21 CFR 176.170 (indirect food additives — paper and paperboard components); EU Regulation 1935/2004 (materials and articles intended to come into contact with food); Swiss Ordinance on Food Contact Materials. Test-method context: ASTM D4303 family for lightfastness of colorants.*

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