I think you are talking about this one Keep in mind, I am by no means an expect in the PRS process, but I have seen a lot of their wood and talked to Paul Miles several times. Most of the swirling you see on the top of this guitar is wood grain. They often stain more than once to enhance the grain. In Private Stock, they may use different colours, and sand the first one back. This further accents the grain in the wood. It’s hard to be sure in the current state of this top, and the lighting, but they may have sprayed a darker burst around the edge. Here are a couple of examples of naked wood, and the stained result. There is a bunch more in an old thread. This is a natural stain - basically making permanent what the wood looks like sprayed with water. This has a hint of copperhead to enhance the grain - basically make the dark bits a bit darker.