Which color is most commonly used in the branding of traditional Japanese washi paper products to signify their authentic cultural heritage?

Cultural traditions around the world are often preserved through handcrafted products that reflect local heritage. These traditional craft brands frequently use specific colors in their branding and packaging that have deep cultural significance. This trivia question explores how traditional artisans strategically use color psychology in their brand identities to connect with consumers while honoring cultural heritage.

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Indigo blue (Ai-iro), representing tradition and nobility in Japanese culture
Vibrant red (Aka), representing good fortune and celebration
Golden yellow (Yamabuki), representing imperial heritage and wealth
Forest green (Midori), representing the connection to nature and craftsmanship