The reason the "N" in the Nutella logo is black while the other letters are red is mainly due to trademark reasons. When Nutella was renamed from its original name Supercrema in 1964, there was already another trademarked brand with the name Nutella written in all red letters. To avoid a trademark conflict and to make the logo unique and protectable as a brand, the creators chose to make the "N" black, differentiating it from the existing brand. This color distinction helped secure the trademark and became an iconic part of Nutella's branding. Additionally, the use of black and red in the logo also serves marketing purposes, with black conveying strength and elegance, and red evoking energy and appetite. This color scheme is also seen in other Ferrero brands like Kinder. The design is not related to any racial connotations, as speculated by some, but strictly a practical decision grounded in trademark law and marketing strategy.
