I assume this is the rebranded/repackaged same product as the prior existing Hair Mist (the price is identical). At the time of writing Harrods is selling both side by side however. Released alongside Oud Satin Mood Hair Perfume (2026).
‘Spray it on your brush or directly onto hair for a fragrant finish. Reimagined from a revered favourite of Maison Francis Kurkdjian’s fragrance wardrobe, the Baccarat Rouge 540 hair perfume arrives as a spellbinding sensorial experience. Crafted with its signature notes of jasmine and saffron, each mist delicately scents the hair while leaving it soft. Lingering with a base of ambergris and cedarwood, this makes for an alluring addition to your rituals.’ – Harrods