Each Architectural Colour is numbered I, II, III, IV or V, according to their tonal weight. For example, Stone I is the lightest, Stone III a mid-tone and Stone V the darkest shade. Related pairings, with their subtle nuances of shade, will create a gentle coordinated feel. Whereas combining the deepest hue with the palest will deliver a more dramatic tonal scheme. Explore our range of architectural paint colours below.