Nezzo guides

Guides for independent perfumers.

Straight answers to the questions that come up at the bench: how to dilute and write a formula, what the IFRA Standards and EU rules ask of you, and how to get a fragrance onto a shelf.

Formulation

How to dilute perfume oil: concentrations for parfum, EDP, EDT and cologneHow much perfume concentrate to use for parfum, eau de parfum, eau de toilette and cologne, how to weigh it, and how to work out any batch size.13 October 2026 · 4 min read

Compliance

EU fragrance allergen labelling in 2026: the new rules for perfumeWhich fragrance allergens must be named on an EU perfume label from 2026, the 0.001% threshold, the deadlines, and how to count allergens inside essential oils.13 October 2026 · 3 min read
IFRA Standards explained for independent perfumers (2026)What the IFRA Standards are, how the 18 product categories and use limits work, how to check your own formula, and what the 52nd Amendment means.13 October 2026 · 4 min read