Full color or 5C means CMYK (Cyan, Magenta, Yellow and blacK), plus a white ink undercoat. Remember, on silver discs, silver is free (and shiny, use a matte silver if you don't want to use the disc silver). Think about your art over white, and your art on silver, think about knockouts. You can go more than 5C if you choose, for example you may want to do 5C + a finish, replace the white undercoat with a Pantone(R) color, or add a 6th color. However, this is something that you really want to talk to our graphics staff about. We have done test discs for clients with finish, 6C and even 7C, but the client often will ultimately end up going with our suggestions to make it 5C. So talk to us before you set up the art for more than 5C. You might find you'll get more bang for the buck by adding a varnish to the disc.
Many replication companies only provide you with 3C (up to three colors on the disc) and silkscreen method. The idea is to charge you more when the art comes in. You make your decision based on the low per unit cost, and then get hit with extra color and offset printing set up charges.
We don't care to do that! We like to help make sure projects done with us look very sharp, so we provide you with full color printing, and the best method for your art - and no extra charges. Our philosophy is to provide you with everything you need to make a quality project, included in the cost.
For a vintage look, try a vinyl LP style disc..