Sand the frame until it s uniform and even and all of the wedges and slices.
Fixing mirror to wood.
Ok this is definitely the most involved option to resolve the problem.
Attach the tape to the mirror then over the wood piece and back onto the mirror.
Place the mirror on top of the plywood and gently press down over the entire surface so that the mirror grips the glue and sticks to the wood underneath.
Avoid using double sided foam tape that can damage a wood surface when removed.
Hold the wood in place and affix a strip of painter s tape over the wood piece to keep the wood from drifting while the epoxy dries.
Place small clamps around the edge of your plywood backed mirror so that the two stick together while drying.
Use the right glue.
Sand the mirror frame with a folded piece of 100 grit sandpaper.
Resilvering is basically removing the protective silver backing of the mirror and reapplying those layers again on the back of the glass.
You can hold up scraps of different types of wood around your mirror and get a pretty good idea of the effect the wood will have in relationship to your existing environment.
With a ripsaw cut a notch into and across the corners of the joint along the edge of the frame.
Aside from eliminating the need for tools during installation the seamless material does not require punching a hole in your drywall.
Hold the mirror up to the closet door and draw small dots with chalk to show where you want the top two corners of.
I guarantee that almost any wood you choose will be an improvement over the blackened edges of the mirror.
Test it in the cut and adjust it as necessary.
The double sided tape can support up to 10 pounds and is ideal for mounting glass tile and artwork.
Another convenient way to hang a mirror is by using scotch clear mounting tape.
Cut a thin piece of matching wood to fit into the saw cut.
The glue is dark brown and will hide cracks and splits.