"Mademoiselle Rochas in Black" Eau de Parfum in a 50ml size might offer a captivating and intense experience. While I don't have precise details about this specific fragrance, it could embody a blend of bold and seductive elements.

It might open with an inviting combination of fruity or citrusy notes, potentially featuring blackcurrant or bergamot, creating a vibrant and intriguing introduction. The heart of the fragrance could unveil floral accords such as jasmine or rose, adding a touch of elegance and femininity to the composition. As the perfume settles, a base of rich and deep notes like patchouli, vanilla, or musk might emerge, providing a sensual and lasting trail.