An ingenious beauty-hack product and the best kept secret the big brands don’t want you to discover: natural alum stone.
Naturally occurring potassium salt mineral has strong antibacterial properties, so it can be used as a deodorant, or to prevent irritation after shaving or waxing, works on spots too!
As a deodorant it’s totally odorless, and leaves your clothes unmarked.
The bloc needs to be slightly wet with water before each use.
A 100 gram bloc will last for several years and has no expiry date.
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All about this fragrance
Vibe check
This is the kind of product that lives quietly on a bathroom shelf and becomes indispensable through repetition: after shaving, after waxing, or as a discreet daily deodorant. It suits a no-fuss routine where the appeal is precision, cleanliness and skin comfort rather than scent.
How to wear
Use it year-round, especially when skin needs a gentle, unscented touch. Wet the block lightly before each application, then glide it over clean skin in a thin layer; it dries down without residue, scent or marks on clothing, and works best when used sparingly and consistently.
Who it’s for
For someone who prefers functional, unscented care with a heritage feel: practical, minimalist, skin-conscious and drawn to natural formulas that do one job well without perfume or fuss.
Release year
1878
Collaborators
Lucien Féret and Roger Féret carried the family business forward and brought Bloc Hyalin into production, turning a traditional mineral stone into the house’s signature practical beauty object.
Féret Parfumeur’s story
Féret Parfumeur is a family-run French house built on practical, heritage skincare and cosmetics, with an emphasis on natural ingredients, made-in-France production and products that feel both old-world and enduringly useful.
Bloc Hyalin’s concept
Bloc Hyalin emerged from the Féret family’s cosmetics business in the late 19th century, when the brothers Lucien and Roger Féret began manufacturing the natural alum stone block. It became a registered reference in France and abroad, later earning medals at the 1900 Paris Universal Exhibition and remaining one of the house’s enduring icons.
Extra info
Bloc Hyalin is not a fragrance but a 100% natural potassium alum stone. A 100 g block can last for years, has no expiry date, and its translucent marbled look helps distinguish the original from synthetic versions.
