It is called Design of Experiments. I custom paint award winning cars. It is easy too make a new custom color. A little bit of this and that, just like your globs. But what do you do when the customer scratches or wrecks a fende? How do you make the original color. Design of Experiments will do that. Here is a hint weigh every color. Yes it is time consuming, but you will be able to create the exact color years later.