"Save for two in the middle of the street, they were all precisely the same — yellow-grey boxes with slate tents on top."
"Now, from out of the ripped-open side of the mountain, a chthonic blood oozed, yellow-grey, viscous, steaming hot."
"Hester looked sideways at him in the hansom as they moved through the streets muffled by fog, passing from the thick, yellow-grey density which caught in the throat, and out into a paler, thinner patch where the light broke through and she could see the black lattice of branches above."