Stephen,
The red is Western Big Leaf Maple burl, doubledyed,
The purple is Carpathian Elm burl, with multiple dyes,
These pieces have been professionally acrylic stabilized !
Double dye stabilizing,
It imparts color throughout the entire piece of wood rather than just the top layer,
plus it stabilizes the wood at the same time eliminating wood movement
and adding structural integrity to wood that is brittle, cracked, or soft.