72Lastly, it is apparent from the case-law that proof of distinctive character acquired through use cannot be furnished by the mere production of sales volumes and advertising material. Likewise, the mere fact that the sign has been used in the European Union for some time is also not sufficient to show that the public targeted by the goods in question perceives it as an indication of commercial origin (see, to that effect, judgment in Texture of a glass surface, cited in paragraph 68 above, EU:T:2007:273, paragraphs 41 and 42).