I was almost finished but what colour should it be?

Ok, let's start from the beginning, my name is Jorge and I might only be 14 years old but i'm the smartest person on earth; I created the flying car,hover-board and the thingy-ma-bob version two just to name a few. You must be wondering how did I do this and I have one answer, science.

Now that you now my back story, can you keep a secret? I'm making a time machine and it's almost done, I just need a colour to choose for it. i am really smart