Comment by Al-Khwarizmi

In Spain it's just called "Bic Naranja" ("Bic Orange") and those of us over 40 or so typically remember the ad slogan which perfectly described their different functionality: "Bic Naranja escribe fino, Bic Cristal escribe normal" (Bic Orange writes thin, Bic Cristal writes normal). Rather lame but to the point and memorable :)