Ultramarine Pink

Overview

Ultramarine pink is the rose-toned sibling of ultramarine blue. It belongs to the same family of synthetic sodium aluminum sulfosilicate pigments, but its pink-to-rose-red shade is produced by heating ultramarine blue with ammonium chloride under controlled conditions. The result is a fine mineral powder, typically 1-5 microns in particle size, that delivers muted pink to dusty rose tones depending on the specific grade and concentration.

Like all ultramarines, the pink version is extremely lightfast, heat stable well beyond normal cosmetic processing temperatures, and resistant to alkali — which makes it a solid performer in soap. The critical limitation is the same one that applies to the entire ultramarine family: it is not acid stable. Below approximately pH 4, the crystal lattice breaks down, the colour dulls to grey-brown, and hydrogen sulfide gas is released. Any formula below pH 4 is off-limits.

Ultramarine pink is widely used in mineral makeup, blush formulas, eye shadows, lip products (check your local regulations), and soap. It blends beautifully with other mineral pigments — combine it with ultramarine violet for a berry tone, or with titanium dioxide for a paler pastel pink.

What it does in a formula

Ultramarine pink provides opaque-to-semi-opaque pink colour. The tone is cooler and more muted than iron oxide red or carmine — think dusty rose rather than bright fuchsia. This makes it a natural fit for blush, mineral foundation tinting, and lip colour where you want a subtle, buildable pink rather than a punchy one.

Because the pigment is insoluble and inorganic, it does not bleed, does not migrate, and does not stain skin the way some organic dyes can. The particle size (1-5 microns) is fine enough to press smoothly into powder compacts but coarse enough to avoid the transparency issues you get with nano-scale pigments.

How to use

Pre-disperse in a small amount of oil (for anhydrous products) or glycerin (for water-based products) before adding to the main batch. Dry mineral pigments clump badly if tossed in as-is — a few minutes of grinding with a spatula or mortar and pestle eliminates streaks.

No special temperature requirements. Ultramarine pink is heat stable through any normal cosmetic process.

Usage rates by product type:

• Mineral blush: 5-30% (blended with mica, sericite, or silica base)
• Pressed eyeshadow: 2-15%
• Mineral foundation (tinting): 1-5%
• Lip products: 1-10% (check local regulations — FDA does not approve ultramarines for lips; EU does)
• Cold-process soap: 0.5-1.5 tsp per pound of oils
• Melt-and-pour soap: 0.25-1%
• Bath bombs: 0.5-2%

Best for / Worst for

Best for: mineral makeup, blush, eyeshadow, soap, bath bombs, any decorative cosmetic at pH 5 or above where you want a muted pink-to-rose tone.

Worst for: any product below pH 4 (AHA peels, low-pH vitamin C serums, acidic toners), formulas where you need a bright neon or hot pink (ultramarine pink is inherently muted), transparent gel products where you need a dissolved tint rather than a dispersed pigment.

Common pitfalls

Acid instability. This is the big one. Below pH 4, the pigment degrades, turns grey, and releases hydrogen sulfide. Always check the pH of your finished formula. Cold-process soap (pH 9-10) is fine. Melt-and-pour (pH 7-8) is fine. An AHA serum (pH 3) is not.

Expecting bright pink. Ultramarine pink is a dusty, muted rose — not a hot pink. If you need vivid pink, look at carmine, manganese violet, or a pink lake pigment instead.

Skipping dispersion. Adding dry pigment directly to a batch produces streaks and specks. Always pre-grind in a small amount of carrier oil or glycerin first.

Regulatory confusion on lip use. Same issue as ultramarine blue — the FDA (US) does not approve ultramarines for lip products, while the EU does. Know your market before formulating lip colour with this pigment.

Substitutes

• Iron oxide red + titanium dioxide blend — mixing these gives a pink tone that is acid-stable, but warmer and less violet than ultramarine pink.
• Carmine (CI 75470) — natural insect-derived red-pink pigment, much brighter, not vegan.
• Manganese violet (CI 77742) — a cool-toned violet-pink mineral pigment, good for shifting the hue toward purple-pink.
• Pink mica blends — pearlescent rather than matte, good for shimmer blush and eyeshadow.