how are old paint colors figured out ?
You have a paint code.
You have a vehicle make and model year.
The above information gives you a mixing formula.
You have a bunch of toners in a mixing bank.
You mix those toners to the formula.
It's as simple as that.
Well..... It's as simple as that if you are doing a complete repaint. It gets more complex if you are trying to repaint part of a car.
That's where blending, tinting, and color variances comes in.