Checking with ACELABELS revealed that their labels are PERMANENT and that you probably need GOO GONE to remove the glue residue. Told them to change the glue since the Minidisc labels are what they are used for: REPLACEMENT and that using GOO GONE on the actual disc casing is not to be recommended in my opnion. Dutchie
For your info: NEATO no longer makes the Minidisc labels. I asked Sony and although they do supply a label set with each disc, they do not supply spare label sets. Thank you Sony, you are a great help!