Hi,
In my oppinion the glass paper is the only one solution. Especially with the parts that are engraved with laser. No other solution can guarantee the removement of the labels.
Well, to use glass paper you need to do some tricks. I use the following:
- on some rolling glass paper machine (Bosh) I put glass paper 200 seeds. This removes the labels within 2-3 seconds.
- With water glass paper number 320 and more into water I polish the surface - it takes not more then 5 - 10 s per chip.
- With pad printing machine I print new labels on the surface - you can't tell that the chip is with exchanged labels. BTW, more of the chips are printed with pad printing technology.
Pad printing allows any characters, labels and signs in any size to printed with extremely high quality on the any surface (more then 300 dpi). Because I'm in the business with pad printing machines I never had problems with "to remade" and "to fake" chips. You can ask pad printing services in your country from peopl ewho are in advertisment business and print ball point pens, lighters, etc.
In my opinion this is the only one good solution. Acids and chemicals can demolish the chip.
regards
Luben