MDF laser cutting
MDF full name is medium density fiber board, consist of wood or plant fibers pressed into panel, now this type of material widely is used to laser cutting for photo frames, toys, kits, decorations, it is also a good option for furniture.
Note: MDF is a fiber sheet, the density is different for each one, so the color of MDF is not same, some deep dark, some light. And the edges are darker than plywood after laser cut
It is nature and normal.