Farrow & Ball's Blue Gray No. 91 is a beautifully relaxed and classic shade, often described as a cooler, more weathered take on their popular French Gray. With subtle mixes of blue, green, and black pigments, it boasts a magical quality of appearing to shift between blue and grey depending on the light and time of day, creating a tranquil atmosphere in any room. The Flat Eggshell finish, while now often superseded by the newer, tougher Dead Flat finish, typically provided a low-sheen satin look (around 20% sheen) ideal for interior wood and metal surfaces like skirting boards, doors, and furniture, offering a more durable and washable alternative to a dead-matt finish.