A color attribute picked up from a pickup surface of a graphics design application document may be used to contaminate a paint data store. An injection color attribute may be re-injected into the paint data store. The resulting contaminated and re-injected paint data store may be used to tint one or more stamps in a stroke drawn on a target surface of the document. Thus, a color attribute of an existing pixel may be sampled and combined with an injection color attribute, such that the color attribute data applied by a graphics data manipulation tool is dynamic over the stroke of the graphics data manipulation tool in response to the picked-up color attributes and the injection color attributes.