In automotive painting I've found that adding a a dark blue or purple to black it seems "blacker".

Most of the time I use Folk Art "Shiny" black with good results.

I'm a painter by trade. Remember, when EVER you touch something up. it's never going to blend in and look the same because you are putting new paint on top of old paint. This is true even if you bought a gallon of paint to paint a wall in your home. Then, 6 months later, there's a chip or scratch that you touch up with the original left over paint you used. You'll still see the touch up. And this is especially true for paints with a sheen or gloss in them. The higher the gloss/sheen, the more visible the touch up.

That said, if you want the EXACT black paint that's on your machine, take a small (dime sized) chip of paint off the very top of the back box. (By top, I mean where a topper would go.) It will never be seen from up there. Then, take that chip of paint into the paint store or HD or Lowes, w/e and they will put it in their color match machine. The machine will break down the paint color and give them the exact recipe to make the black color on your machine. You just have to decide what gloss/sheen you want the paint to be. As I said, you will still see your touch up spots regardless. Depending on the sheen, you'll see them even more. The higher the gloss/sheen, the more the touch-up shows. Over time and as the paint ages, it blends in a little better.

Also something to consider is that the higher the gloss of the paint, the more it helps to protect the machine. The gloss helps to reflect UV rays off the paint to protect more from fading as well as making it easier to clean. So there's a lot of things to consider when choosing a gloss/sheen.

For me, I redid my South Park machine over with eggshell finish black. Why? Well, there were some scratches and a few gauges insides of the machine. The eggshell finish makes those blend in more where as a glossy/shiny paint would make those imperfections show up even more. Additionally, if I have to touch it up in the future, the lesser sheened eggshell finish will blend in better and be tougher to spot than a glossy sheen. Remember, the higher the gloss, the more imperfections you will see.

Sheen types mainly run...High Gloss - Semi Gloss - Satin - Eggshell - Flat. In that order from super shinny (High Gloss) to no sheen at all (Flat).

I like eggshell because it gives you a little bit of sheen to help protect the paint from some fading and for cleaning your machine while also hiding imperfections better. However, if my machine were in excellent condition I would have used a semi-gloss finish paint. The semi gloss would make it more shinny to accent the niceness off the machine while also giving it great protection from fading and making it far easier to clean. Think of the higher sheen as you would a clear coat on a car. The clear coat protects the actual paint color. The gloss/sheen of the paint acts in the same way.

Hope this helped. Should you or anyone have any more questions, please feel free to PM me. I can even PM you my phone number back and we can talk.

Good luck.

I have found the Testers hobby paint to work really well. I get a small jar of both flat and gloss black and see which one looks best on that particular machine. I touched up my Getaway on the side of the cabinet where there was wear at the flipper buttons with the gloss and you can hardly notice the touch up.

+1

Pinball Universe have some paints. I've used the TftC purple that matched rather nicely.
http://www.pinballuniverse.com/PinballPaints.htm

Also these to mix your own colors.
http://www.createxcolors.com/products.html

Not always true. I recently did a touchup with the leftover paint that was originally painted 10 years prior with a PERFECT match. A lot depends on the paint quality. Graham ceramic.

I have been using an acrylic tube type paint I bought at Hobby Lobby (Fine Touch) for early solid state playfields. The black, red, med yellow, flesh have matched perfectly straight out of the tubes. Of course this work has been cleared so the gloss gets evened out. If the black was not cleared it does show a different gloss level. MIght be worth a try at $12.99 for 24 colors in 12 ML tubes.

You should try some of the acrylic in a tube for a dollar or 2. I think it looks blacker than the original ink when it goes on. The stuff the paint store tints paint with is Not paint, just a colorant/tint (Lamp black) that can only be added up to a certain % before it alters the paint characteristics too much. I have bought it before at Menards but they no longer carry it as far as I know.