
This light blue one it hardly shows at all compared to mine (only the strong sunlight helped it today). Mine has far less body colour coverage than this one and due to the colour shade differences on mine between undercoat and body colour it really shows up on mine unlike this one.
Silver, white and red it will be much harder to spot due to undercoat colour. Even black with the dark yellowish undercoat its harder to see. I think the grey uses dark yellow undercoat too from memory of James Gould's.