At one time, Shu-iro (Empire red) was considered auspicious and best suited for congratulations, purple was considered showing respect to the other side, indigo was considered to be used for mourning, Rikyu (sophisticated wasabi-color (slightly dull yellowish green)) was usable for both congratulations and condolences, Enji-iro (crimson) was considered traditional Japanese and so on were mainstream, but today, they are also diversified.
かつては、喜事を表し祝いに最適とされる朱色、先方への敬意を表すとされる紫色、弔事に用いるとされる藍色、慶弔両方に用いることができる利休（品のある山葵色）の他、日本の伝統色とされる臙脂色、などが主流であったが、これも現在では多様化している。