Hi, (Not sure if this should be in the technical section - please move if req)

Been popping on and reading for a while now with the capri (had it near 2 years now), but recently got myself an 87(D) Orion 1600i Ghia and have a question....
When i HPI'd the car, it said "1 colour change", but i looked everywhere on the car inside and out, took bits off etc and there was no trace of any other colour.
Last night after cleaning the engine bay, i noticed the colour plate (is this what it's called?) listed the colour as "Primer"

Does anyone know why this is?
Not massivly worried about it, but curious.

Planning to request history from the DVLA, but am unsure whether this would give me any info.
I've searched the forum (and google'd) but only seem to be able to find info on Motorsport shells being ordered in primer so it could be painted custom colours.

Cheers
Ian

ps: the car is white (with a grey lower half)
I have all mot's, it's had 4 owners, and has done 44k