**For hand stirring, either clockwise or counterclockwise is fine.** The procedure you’re probably remembering is **tempering**, also called *pre-crystallisation*. It controls the cocoa butter’s crystal structure so the finished chocolate sets with a glossy surface and a firm snap. Callebaut identifies time, temperature and movement as the key factors; its instructions prescribe no stirring direction. [Callebaut’s tempering guide](https://www.callebaut.com/en/callebaut-chocolate-academy/tutorials/tempering/table)

Your friend’s factory story could have involved a **particular machine’s required rotation**. For example, Cargill chocolate specialist Joe Sofia describes a tempering machine whose bowl turns clockwise against fixed scrapers. That arrangement mixes the chocolate and distributes cocoa butter crystals. Its direction follows the equipment’s design. [Chocolate-Tempering Equipment and Techniques](https://courses.ecolechocolat.com/lobjects/pdf/sofia_tempering_machines.pdf)

Another possible term is **conching**, an earlier mixing and shearing stage. Industrial conches can use different rotation directions for different stages of processing. [A study of industrial conching](https://pmc.ncbi.nlm.nih.gov/articles/PMC6952490/) The reference to **shine**, though, points most strongly to **tempering**. Identifying the factory’s equipment would be necessary to establish which direction mattered in that particular case.