4-Butylresorcinol

Product Description

Green Stone Swiss supplies high-purity 4-Butylresorcinol manufactured under strict GMP-aligned quality systems, ensuring consistent batch-to-batch performance for professional cosmetic and personal care brands worldwide. Our direct factory supply model delivers reliable bulk quantities with full technical documentation and free sample support.

4-Butylresorcinol is a resorcinol derivative used as a spot-care active. In leave-on systems it is positioned for uneven tone and localized dark spots, where formulators want a single molecule associated with tyrosinase pathways rather than a plant extract blend. It is poorly soluble in water and is handled as a pre-dissolved concentrate in ethanol or glycols. The powder is white to off-white.

Brightening serums and spot treatments continue to specify this INCI because the assay and use level are easy to control. Cosmetic-grade 4-Butylresorcinol is a practical bulk active for brands building a focused tone-evening range.

Product Specification

• INCI Name: 4-Butylresorcinol
• CAS No.: 18979-61-8
• Molecular Formula: C₁₀H₁₄O₂
• Molecular Weight: 166.22 Da
• Appearance: White to off-white powder
• Purity: Typical ≥98%
• Solubility: Poorly soluble in water; soluble in ethanol and glycols
• Suggested pH: 4.0–6.5 in finished systems
• Storage: Store in a cool, dry place; protect from light and moisture

Key Benefits & Applications

4-Butylresorcinol is a defined resorcinol active used in dark-spot and tone-evening leave-on systems.

• Used in spot serums targeting localized discoloration
• Supports even-tone formulas that call for a tyrosinase-pathway active
• Fits gel-serums and light emulsions once it is fully pre-dissolved
• Pairs with niacinamide or other tone-care actives in multi-step brightening chassis
• Typical use level: 0.1–0.3% in leave-on formulations

Formulation Guidelines

Follow these guidelines to keep 4-Butylresorcinol dissolved and within a mildly acidic window.

• Suggested Use Level: Typical 0.1–0.3% in the finished formula
• pH Range: Suggested 4.0–6.5
• Addition: Pre-dissolve in ethanol or a glycol, then add during cool-down below 40°C
• Stability: Protect from light; recheck for recrystallization in high-water, low-solvent systems
• Combine with Niacinamide when a second tone-evening active is needed in the same chassis.