Well, if a blue mouse has been run over by a yellow steamroller...
The blue mouse should stay blue all the time. Because...
a) The fact that the color of the steamroller is yellow doesn't mean that it will dye or paint the mouse of the same color. 🤔
b) Well, unless that the steamroller is in fact soaked with yellow paint and then the blue mouse eventually would acquire a handsomely flat yellow dyed tone. :D
Ah the fun part of the silly questions statements. The steamroller would flatten the mouse, unless it was mighty mouse. Now if the steamroller is paving the yellow brick road, would not the man behind the green curtain be able to fix the blue mouse like he fixed the tin man and the straw man and the cowardly lion?