Purpleheart is the king of color in the land of veneer. This species will turn to a rich brown color with exposure to UV sources such as sunlight, but here is a little trick I learned many years ago... A quick wash coat of bleach will typically brighten unfinished purpleheart veneer to a unique purple/pink color. After the veneer is applied to the panel (using a PPR glue), sand it smooth and apply a light coat of bleach. Once it has dried, neutralize the bleached surface with a mixture of 50/50 white vinegar and water. After the surface has completed dried,  apply my finish coat.

This process brightens the wood quite a bit and as daylight does its job of darkening the veneer again, I've found that it often stays purple-ish for many, many years.