The Formulation Science of "Makeup Remover Emulsion Systems": Why Do Some Cleansers "Cleanse Instantly / Rinse in Seconds," While Others "Cause Increasing Suffocation / Rampant Closed Comedones"?

Makeup Remover Oils/Balms: The Experiential Gap That Confuses Everyone

All makeup removers promise thorough cleansing, but the post-use experience varies drastically: some turn milky white instantly upon contact with water and rinse completely clean, leaving the skin refreshing and breathable; some remain greasy after prolonged rubbing, leaving a film-like feeling after washing, and causing rampant closed comedones and breakouts within a few days; and others, claiming to be "gentle and skin-nourishing," fail to remove waterproof mascara and long-lasting foundation no matter what, leading to dull skin tone.

These vastly different outcomes all point to the same variable: the polarity of oils and the phase inversion emulsification mechanism—whether the makeup can be thoroughly dissolved, whether it can be instantly and completely emulsified upon contact with water, and whether there is any residue after rinsing.

Basic Principle: Why Do Makeup Removers Need "Like Dissolves Like" and "Emulsification"?

Daily makeup, sunscreens, and excess sebum secreted by the skin are essentially mixtures of oil-soluble substances or powders encapsulated in oils. Water cannot wash away oil.

The basic logic of makeup removers is "like dissolves like": using the base oils in the formula to dissolve the makeup oils. But since oil is insoluble in water, if there is only oil without emulsifiers, the oil and water will separate during washing, leaving the face covered in grease. The role of emulsifiers is to act as a "bridge," grabbing oil with one end and water with the other, turning the oil that has dissolved the makeup into tiny droplets that can be washed away by water.

The key issue is that the dissolving power of different oils and the "phase inversion" speed of different emulsifiers vary enormously, which directly determines whether your makeup removal experience is "refreshing and clear" or "suffocating and breakout-prone."

Core Mechanism: "Water-Triggered Phase Inversion Emulsification" in Makeup Removal

Thorough makeup removal is not completed during the dry rubbing with dry hands and face; it is triggered the moment water is added and rubbing begins.

In an anhydrous state, the makeup remover oil/balm is a pure oil phase (or a water-in-oil system), where the oils fully dissolve the makeup. When a large amount of clear water rushes in and is rubbed, the water content in the system increases sharply. At this point, the hydrophilic ends of the emulsifiers face outward and the lipophilic ends face inward, forcing the entire system to undergo "Phase Inversion" within seconds, instantly flipping from an oil phase to a milky-white Oil-in-Water (O/W) emulsion.

This explains why good makeup remover oils "turn white in seconds" upon contact with water: the faster and more thorough the phase inversion, the smaller the emulsion droplets formed, making them easier to be completely washed away by water flow without leaving an oily film—this is a natural "transient emulsification" characteristic.

Key Variables: Three Factors That Determine "Rinsing in Seconds" vs. "Rampant Closed Comedones"

Factor 1: Polarity and Molecular Structure of Base Oils

This is the most fundamental structural parameter determining the "dissolving power" and "comedogenic risk" of the makeup remover.

• Polar Synthetic Esters (e.g., C12-15 Alkyl Benzoate, PEG-7 Glyceryl Cocoate): Extremely polar, capable of instantly dissolving stubborn waterproof makeup and film-forming agents, "like a high-efficiency oil-dissolving gun." But the trade-off is: some small-molecule synthetic esters have strong penetration; if emulsification is incomplete, they easily penetrate pores and trigger comedones and acne.

• Non-Polar Oils (e.g., Mineral Oil, Squalane): Stable molecular structure, do not penetrate the skin, extremely safe, with virtually zero comedogenicity. But their dissolving power is weaker, requiring longer rubbing time to remove heavy makeup or waterproof sunscreen.

• Natural Plant Oils (e.g., Jojoba Oil, Safflower Seed Oil): Excellent skin affinity, rich in free fatty acids. But natural oils easily oxidize and deteriorate; the formula must be compounded with potent antioxidants (like Vitamin E, rosemary extract), otherwise it can easily lead to dull skin tone.

Factor 2: HLB Value and Addition Ratio of Emulsifiers

This is the core reason for "increasing suffocation / closed comedones after makeup removal." The HLB value (Hydrophilic-Lipophilic Balance) determines the phase inversion speed of the emulsifier upon contact with water. If the emulsifier addition is insufficient, or the HLB value is mismatched, the oil cannot fully flip into an O/W state after adding water, instead forming large emulsion droplets. These large droplets cannot be washed away by water, remain in the pores, and combined with the physical stimulation of rubbing, will trigger severe closed comedones and inflammation.

Polyglycerol emulsifiers (e.g., Polyglyceryl-10 Diisostearate, Polyglyceryl-4 Oleate) are highly recommended advanced choices by formulators. They possess an extremely high HLB value, achieving explosive emulsification the moment they touch water, leaving a "squeaky clean" feeling on the skin after rinsing. Formulation tests show that a combination of polar synthetic esters (for fast dissolution) + Squalane (to reduce comedogenicity) + Polyglycerol emulsifiers (to ensure instant phase inversion) can achieve ultimate makeup removal power, zero residue feel, and an extremely low breakout rate—this is one of the best strategies for balancing "powerful makeup removal" and "gentle safety."

Factor 3: "Film-Forming Strength" of Makeup/Sunscreen

The performance of the same makeup remover can be vastly different when facing daily commute makeup versus outdoor waterproof makeup—waterproof makeup contains a large amount of film-forming agents (such as TMS), which cling to the skin like a plastic film. This means: for daily makeup, a gentle plant oil makeup remover can handle it; but for high-SPF waterproof sunscreen, products containing highly polar oils and high-concentration emulsifiers must be used, otherwise it will "fail to clean thoroughly," leading to pigmentation.

"Refreshing and Clear" vs. "Increasingly Suffocating / Causing Closed Comedones": Explanations of Two Extremes

"Refreshing and Clear" (Positive Thorough Emulsification Effect)

A high-quality makeup removal system can achieve perfect transient phase inversion: during dry rubbing, the oils fully dissolve the makeup; the moment water is added, the emulsifiers cut the oil phase into nanoscale tiny droplets, which are easily washed away by the water flow, leaving pores completely unblocked. Selecting polyglycerol emulsifiers with high HLB values and controlling the oil polarity pairing are the keys to achieving this benign cleansing.

"Increasingly Suffocating / Causing Closed Comedones" (Negative Incomplete Emulsification / Excessive Friction Effect)

This is mainly caused by "insufficient emulsifier addition" combined with "inferior oils": to save costs or pursue a so-called "moisturizing feel," the proportion of emulsifiers is reduced. After adding water, the system emulsifies incompletely, and large oil droplets remain at the follicle openings; meanwhile, to wash away the unemulsified oil, users have to use strong cleansers for secondary cleansing, or rub forcefully, leading to stratum corneum damage and pore clogging. Formulation data points out that if the emulsifier addition is below 15%, the incidence of closed comedones will significantly rise. Incomplete emulsification = suffocation and breakouts; excessive secondary cleansing = barrier damage. This is the biggest formulation challenge for makeup removers.

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2026 Industry Trends: From "Powerful Dissolution" to "Microbiome and Barrier-Friendly Makeup Removal"

The 2025 Global Cleansing Skincare and Microbiome White Paper points out that consumers face an average of over 2.1 concurrent barrier damage and microbiome imbalance issues; merely pursuing "cleaning thoroughly" is no longer sufficient. R&D is shifting toward "skin-nourishing microbiome makeup removal": introducing natural-origin emulsifiers (such as olive-derived alternatives to PEG-7 Glyceryl Cocoate) into the makeup removal system, and compounding them with bisabolol, ceramides, or prebiotics. Allowing makeup removers to dissolve makeup without stripping the skin's natural lipids, and even regulating the microbiome balance on the skin surface, upgrading makeup removal from a "cleansing step" to "the first step of barrier repair."

100% plant-derived, biodegradable makeup remover oils/balms, due to their extremely high eco-friendly attributes and friendliness to sensitive skin, are becoming a key trend in high-end Clean Beauty cleansing lines.

Core Takeaways

"Rinsing in seconds" and "rampant closed comedones" are fundamentally the result of four interacting variables: the polarity of base oils, the HLB value and ratio of emulsifiers, formulation design, and the film-forming strength of the makeup.

There is no universally "best" makeup remover oil—only the optimal emulsion matrix tailored to specific makeup types (daily/waterproof) and specific skin types (oily-acne/dry-sensitive). Understanding this phase inversion emulsion science enables you to decode the logic behind makeup remover ingredient lists and find the true balance between "powerful dissolution" and "gentle non-comedogenic" for your products.