Good point indeed Paul, IMO it is up to the cable manufacturers to ensure that the colouring of the insulation meets the specification given to them for making these cables. I've noticed a lot of the White Phase colouring on middle conductors, is often tinged with other colours. But, right, Light Blue is Light Blue, not dark blue. I haven't used a lot of flex cable recently so I can't really comment on the colouring of the Neutrals in them.
