To apply LE VOLUME DE CHANEL over the BEAUTÉ DES CILS mascara base, start by coating your lashes with the mascara base, and then follow up with a few coats of LE VOLUME DE CHANEL for added volume and length. This product is ophthalmologist tested and suitable for contact lens wearers, ensuring its safety for use around the delicate eye area. LE VOLUME DE CHANEL is typically used in cosmetic formulations in a 6% concentration to provide its desired effects.