Common Name(s): Alpha-isomethyl ionone,iraldeine,methylionone

CAS Number: 127-51-5

DESCRIPTION

What It Does: Provides sweet violet-iris fragrance note of synthetic origin.

Why It's Used: Essential synthetic violet note – alpha-isomethyl ionone provides the violet-iris character central to many classic and modern perfume compositions.

How It Works: Synthetic ionone derivative absorbs to skin and hair for substantive, long-lasting fragrance. woody-violet character provides complexity to fragrance blends. good fixative properties extend top note duration.

Typically Found In: Fragrances,perfumed cosmetics,hair care

TECHNICAL DETAILS

Primary Category: Fragrance component – violet/iris synthetic

Secondary Functions: Skin conditioning

Application Areas:

Typical Concentration Range: 0.001%–1%

SOURCING & ETHICS

Vegan Status: Conditional - supplier confirmation required

Halal Status: Unverified - supplier confirmation required

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier. [audit 2026-07-29 rev2: the record's own source_notes does not assert a non-animal origin, or instructs the reader to verify with the supplier; "yes" asserts knowledge the record does not hold. determination requires shariah-panel sign-off.]

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Eu cosmetics regulation: declared fragrance allergen. ifra guidelines apply.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

The ionone family of fragrance compounds (including alpha/beta ionone and alpha-isomethyl ionone) are responsible for the characteristic violet scent. natural violets (viola odorata) produce ionone compounds that specifically desensitise olfactory receptors after brief exposure – causing the violet's famously 'disappearing' scent. synthetic ionones provide the violet note without this rapid olfactory adaptation.

Last Verified: 2026-03-12

Primary Sources: Cosing database,ifra standards