Tonus 4Tonus 4 is a colour update of Tonus, an elastic upholstery fabric by late textile artist Nina Koppel. Ideal for modern organic furniture and characterised by rare colour richness, it comes in a total of 47 hues, of which 19 are new. Now recognised as a classic textile, Tonus brings colours to life in vibrant, precise fashion. Building on this characteristic, the intensity and brightness of all the colours have been increased. It can also be used for