A total of 21 colour finishes have been introduced to the woollen fabric collection, which was first launched with six neutral shades in 2020.
Sumi's new styles are designed to enhance the versatility of the collection, which can be used for upholstery, vertical surfaces, curtains, drapery and acoustic panels.
The Sumi collection is crafted by Camira using worsted wool, which grants the fabrics a minimal "organic aesthetic".
All colourways in the expanded collection, which range from pastels to brights and dark tones, are achieved using natural dyes.
"Sumi has been such a popular product since its launch last year that we felt it was the perfect time to expand its colour offering with these 21 beautiful new shades," said Camira's head of creative Lynn Kingdon.
"Inspired by natural dyes, we really sought to develop colours which could be created from plants and minerals and were very much in tune with the organic aesthetic of the range."
Sumi textiles are all designed and made at Camira's manufacturing facility in Yorkshire, England, and dyed in its neighbouring dyehouse using water from the Pennine hills.
The new colours are available to purchase from 20 September.
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