4-Butylresorcinol
High performance brightening active for stubborn dark spots and uneven tone. Works at low use levels when properly dissolved and processed.
4-Butylresorcinol is a potent brightening active used to support the look of more even skin tone and reduce the appearance of dark spots.
It is ideal for advanced tone correction formulas, including spot serums, brightening emulsions, and targeted treatments for discolouration.
Because it is not water soluble, it must be fully pre-dissolved in a suitable solvent phase before adding into your formula to avoid grainy texture or fallout.
FEATURES
- Targets uneven tone – supports visible improvement in dark spots and discolouration.
- Low dose performance – effective at low percentages when dissolved correctly.
- Professional brightening stacks – pairs well with niacinamide, tranexamic acid, alpha arbutin, and stable vitamin C systems.
- Best in leave on formulas – designed for serums, creams, and spot correctors.
BEST FOR
- Dark spot serums
- Even tone moisturisers
- Spot correctors
- Melasma support routines
- Brightening emulsions
FORMULATION GUIDELINES
| INCI | 4-n-Butylresorcinol |
|---|---|
| Type | Brightening active (tyrosinase inhibition support) |
| Solubility | Not water soluble. Requires solvent or oil phase premix. |
| Use Rate | 0.1–1.0% typical for leave on brightening formulas. |
| Best Phase | Solvent premix or oil phase, then add in cool down |
| pH Compatibility | We recommend finished product pH 4.5–6.5 for best overall compatibility in leave on skincare. |
| Temperature Tolerance | We recommend avoiding prolonged heating. Dissolve efficiently, then add below 40°C where possible. |
| Pro Tip | Pre-dissolve 4-Butylresorcinol fully before adding to the batch. A good dissolve step prevents crystals, graininess, and uneven performance. Add during cool down and mix well for uniform distribution. For best results in dark spot formulas, pair it with a supportive brightening system and barrier friendly helpers to reduce irritation risk. |
| Appearance | White to off white powder |
| Stability Notes | Crystallisation risk is the main failure mode. Control solubility, process temperature, and cool down handling to keep texture smooth. |
| Storage | Keep sealed, cool and dry. Protect from light and humidity. |
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