Essential oils vs. fragrance oils — and why we only use one

Walk into any craft store and the soap-making aisle has two kinds of bottles: essential oils and fragrance oils. They look the same. They cost very different amounts. They behave very differently on skin.

The short version

Essential oils are extracted from plants — distilled from lavender flowers, cold-pressed from orange peels. Fragrance oils are synthetic blends, often petrochemical-derived, formulated in a lab to smell like something (sometimes that something doesn't even exist as a plant — "ocean breeze," "cotton candy").

Why fragrance oils dominate the industry

They're cheaper. They smell stronger. They're more shelf-stable. A bar made with fragrance oil will smell like the day it was poured a year later. An essential-oil bar will fade.

Why we only use essentials

Two reasons. First, our skin. Fragrance oils are the most common cause of contact dermatitis from soap — even the ones marketed as "skin-safe." Second, our nose. We'd rather have a real bar of citrus that fades than a fake bar of "tropical breeze" that doesn't.

The trade-off is honest: our scents are subtler. They mellow with curing. That's the deal.