roughen

The process uses large stones to roughen up the fabric being processed.	Le procédé utilise de grosses pierres pour endommager le tissu en cours de traitement.
After this, the surface is sandblasted to roughen it slightly and help the lacquer to adhere to it more effectively.	Ensuite, la surface est sablée de manière à devenir légèrement plus rugueuse, offrant ainsi une meilleure adhérence à la laque.

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