News Letter

Hello, This is Sunjin Beauty Science.

O/W (Oil-in-Water) base makeup that gives skin a light, breathable feel with lasting moisture — it's the dream formula every makeup formulator around the world has wanted to try at least once.

Yet why do 99% of foundations and BB creams on the market still rely on heavy, occlusive W/O or W/S (silicone) systems? Because in O/W formulations, the moment moisture evaporates, pigments migrate messily into fine lines and uneven skin texture, causing the "White Chalk Line" phenomenon — and coverage deteriorates so drastically that the product loses its function as makeup.

Breaking through these persistent challenges, Sunjin Beauty Science R&D Center presents our unique [O/W Hydrating Skin-Tone Foundation - Color Prep] guide. It perfectly balances the refreshing texture of an O/W system with the high-performance coverage and adhesion of a W/O formulation.

1. 'Instant Tone-up' with the Lightness of Skincare

Today's consumers are moving beyond simple white cast coverage. They want "Hydrating Glow" makeup — something that applies as lightly as a lotion while naturally correcting skin tone and caring for blemishes. The key to this formulation is capturing both the overwhelming hydration of O/W and reliable complexion correction at the same time.

2. Does O/W Foundation Always Suffer from Coverage Breakdown and Settling into Fine Lines?

The biggest challenge in O/W formulation lies in the "water evaporation mechanism." Conventional hydrophilic pigments exist in the water phase of the formulation, and when moisture is absorbed and evaporates upon skin application, the pigments lose their carrier and are pushed down into the valleys of skin contours, clumping messily. The result is the "White Chalk Line" phenomenon — white lines forming along skin texture — and pigments fail to adhere uniformly, causing coverage to collapse.

3. How Does AQUA-TITAN(EWG) Perfectly Prevent Pigment Settling?

• Successful Water-Dispersion of Hydrophobic TiO₂: We have overcome the limitations of conventional hydrophobic powders, which are advantageous for oil-phase and skin adhesion but notoriously difficult to incorporate into the O/W water phase, using Sunjin's advanced dispersion technology.
• Formation of a Smooth, Even Layer: During application, hydrophobic particles interact uniformly with the oil film and the skin surface. This fundamentally prevents pigments from migrating into skin crevices along with evaporating water, ensuring a smooth, clump-free ‘Even Spread’ layer even on textured skin areas.

4. The Ultimate Solution: [Color-Prep] Guide Formulation (featuring 5.0% AQUA-TITAN EWG)

Sunjin’s AQUA-TITAN (EWG) perfectly overcomes the inherent limitations of O/W systems by stabilizing 70% high-content hydrophobic-treated Titanium Dioxide (TiO₂) in a water-dispersed liquid slurry.

• Powerful Natural Coverage: While maintaining the refreshing, lightweight feel of an O/W system, the hydrophobic pigments remain firmly anchored to the oil film even after water evaporation, delivering the flawless, high-performance coverage typically seen in W/O formulations.
• Innovative Powder-Free Process: Say goodbye to the cumbersome process of beading powder into an oil phase or prolonged mixing. Simply inject directly into the water phase to achieve a uniform emulsified texture, significantly reducing both the complexity and energy requirements of the manufacturing process.
• Hydrating Cream-like Adhesion: We have fundamentally eliminated the instability often caused by inorganic UV filters. This ensures smooth, effortless rolling without any drag, providing a clear, reliable tone-up effect that does not settle into pores.
• EWG Green & Clean Beauty: Formulated primarily with EWG 1–2 grade ingredients, this solution is perfectly suited for mild, skin-friendly sun care and makeup base formulations for sensitive skin.

5. Completing a Luxurious Skin-Beige Tone with TINA Series Matching

By pairing with Sunjin's TINA Series (Yellow, Red, Black) — iron oxides coated with naturally-derived zinc stearate — you can robustly defend against sebum-induced darkening while correcting artificial white cast into a luxurious, natural skin-beige tone, creating synergy as a dual-purpose makeup base.

What everyone said was impossible — "perfect adhesion and coverage in an O/W system" and "a moisturizing foundation free of White Chalk Lines" — can now be realized with AQUA-TITAN(EWG), the culmination of Sunjin Beauty Science's advanced technological expertise.
If you are considering developing next-generation O/W foundation formulations to lead the global makeup market, request Sunjin's technical solutions and guide samples now!

Summary Q&A

Q1. When designing makeup (foundation/tone-up) products in an O/W system, what causes pigments to settle messily into fine lines and pores after application?
A1. It is caused by pigment migration occurring as moisture in the formulation evaporates. Conventional hydrophilic pigments fail to adhere uniformly when moisture is absorbed and evaporates into the skin — pigment particles are pushed into fine lines and textured areas (valleys) where they easily aggregate. This results in the "White Chalk Line" phenomenon of white lines forming along skin texture, or uneven smearing.

Q2. Why does O/W foundation consistently have inferior coverage and longevity compared to W/O formulations?
A2. To achieve strong adhesion and coverage in makeup, hydrophobic pigments with high affinity for the oil phase and skin surface are required. However, conventional hydrophobic pigments cannot be incorporated into the water phase of O/W formulations — making it difficult to increase or maintain pigment content in O/W makeup, ultimately resulting in coverage that easily breaks down.

Q3. Is there a way to simultaneously achieve the fresh moisture feel of O/W and the high coverage of W/O in an O/W makeup formulation?
A3. Yes — by applying a water-dispersed system ingredient that stabilizes hydrophobic pigments in the water phase. With Sunjin Beauty Science's AQUA-TITAN(EWG), the refreshing moisture feel unique to O/W formulations is preserved, while hydrophobic pigment particles remain firmly anchored to the oil film and skin surface even after moisture evaporation — delivering a smooth Even Spread layer without clumping, along with excellent coverage.

Q4. What specific base makeup formulations can this water-dispersion technology be extended to?
A4. It can be applied across a wide range of O/W-based base makeup formulations requiring light, moisturizing textures — including tone-up sunscreen, sun serum, skin tone foundation, makeup base, cushion foundation, and BB cream. It is highly useful for designing next-generation makeup formulations that must simultaneously satisfy high SPF and clean complexion correction without compromising texture (heaviness, thickness).

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