We permanently mark the mesh in the following way.....simple black sharpie marker in two or more corners.
We then take some 5 minute epoxy we buy it at America's gateway to china...... Walmart.
Mix up a little and take a business car, small old brush or your finger and coat the mesh on both sides of the sharpie mark .
When the 5 minute epoxy is cured, oddly enough in about 5 minutes

, the ink will be encapsulated and remain forever!!!!
If you don't like the 5 minute epoxy method steal some clear fingernail polish from your better half and do the same using the polish, be sure first the polish will not smear the ink...5 minute epoxy absolutely will not smear the ink.
Respectfully
mooseman