"Blend in as the light fades"?? What does that mean? Can't say I've ever had too much difficulty spotting my car after dark 
... demonstrated in this video -
https://www.youtube.com/watch?v=DY9AHULgZ7c
Please don't take this personally but what an absolute load of old bo****ks. I had my last car 12 years and it was black, no problems. I've also had dark blues and greys without difficulty. In fact I've only (touch wood) been involved in one traffic incident in over 32 years of driving which was in my current car in broad daylight. I'd suggest the biggest factor is not your car's colour but in other drivers just not looking. Buy the colour you want and don't worry about it.
Only issue I see in dark cars fading into the darkness is if they're in the habit of driving without any exterior lighting on at all. The intensity of reflections of a light coloured car off street lighting and car lighting pale into insignificance vs the front and rear lighting output piercing the darkness of night. That video just shows how much an unlit car becomes less visible as light fades, but as auto lights have been around a fair while and they come on as soon as light levels drop just a little, I don't see it as an issue - lit cars at night are visible, no matter the colour.
I've had 2 Tornado Golfs hit from behind, and in both cases the car was at a standstill in good lighting - they were just hit by idiots!
