Bleeding is 1) the loss of blood that is blood escaping from the circulatory system from damaged blood vessels; 2) the diffusion or seeping of a soluble paint from the substrate through the top coat colour. (e.g., visual effect achieved when a dark colour bleeds into a lighter colour)
Reference Definition by Valpac.com: Bleeding is the diffusion of colouring matter through a coating from the substrate; also, the discoloration arising from such diffusions. In the case of printing ink, the spreading or running of a pigment colour by the action of a solvent such as water or alcohol.
Related Definitions in the Project: The Insulation and Painting