What colour is smoke-blue?

It's a greyish-blue, much loved by fashion designers because a marvellous effect can be achieved by using layers of soft, floating fabrics. A smoky effect, if you like. The emphasis stays on the blue, but mustn't be too far emphasised, otherwise the ephemeral effect of smoke will be lost. It isn't so successful as a static colour. For example, if you paint a wall smoke-blue it will look either blue or grey depending on the ambient light. If you want smoke-blue in your decor, paint your walls in a neutral tone tending towards grey with no creamy warmth, and then use swathes of blue and grey fabrics to get your desired effect. Just hang them up anywhere; at night with soft lights the result will be spectacular.