This is just standard 4mm birch ply wood stained with Tudor black oak stain

laser cut  after so no stain ran into the cut

then we laser engraved  it back to the whiter birch plywood  surface white  gives a great effect

you can even see the whiter birch ply wood grain showing though the black oak stain  stunning look

Tudor black oak stained onto 4mm birch ply then engraved to bring the light colour of the birch back