Black, boot Black and very, very dark Blue

[Ivor Hawkins]

Tell me about it!!  I once repaired a friend's car door which was painted "Masons black".  We both thought it looked great until when stopped for petrol one night the filling station's fluorescent lighting showed up the repair as a completely different shade.....

That’s called metamerism and is a result of mixing a colour with a different formulation...it’s quite possible to match a colour using a range of formulations and the differences tend to show up under different light sources.

The main problem is when individual panels are painted using different formulation#, you can blend across the adjacent panels, which minimises the mis-match.