The time was when signs were done with stick on cut letters on a reflective substrate. Any more, though, we can print with our digital process on reflective adhesive vinyl. That gives you all the colors of the rainbow!
This reflective sign is one I saw on a recent vacation to Park City. It’s not very complicated, but it’s a good example of what can be done digitally. In the past, we would have cut two different colors of vinyl and applied them to a reflective blank. Now we print on reflective adhesive backed vinyl, and apply the whole thing to a blank piece of aluminum.
It’s much less time consuming, and gives you a much wider choice of colors.