The color palette of Noble Souls upholstery is created using varying concentrations and applications of vegetable based dyes. Indigo dye for blues, and gallnut dye for greys and blacks. No other artificial chemicals are used, and the China has a long history of using plant dyes which continues today, and its traditions and techniques been alive in a remote part of China for hundreds of years, shielded from modernity by its rugged mountainous terrain.