My main concern is clarity, you know those car mirrors with an LED compass or whatever in them? That's what I'm aiming to achieve. An LED display will be behind the glass, as such if it's frosted I don't think I'll be able to see it very well?

Are you saying that I'll not be able to get a clear space left after sandblasting?

Thanks for the info, I really appreciate it.

Chris.

I realize this thread is from weeks ago, but I haven't been on here recently.
Sandblasting won't leave clear glass. Period. And nothing will change that after the fact, esecially if you're trying to create text or a pattern; there's no way you can go in afterwards and polish it back. The "Silver removal" thread (which I haven't looked at to see where it's gone lately) is the means you need for what it sounds like you want. If you just need light transmission from LEDs etc, sandblasting through mirror will give you ample effect; it just won't be clear.

As for the "mercury" query, it's a moot point if you're removing the mirroring by either sandblasting OR chemistry. Either way, the chemicals and abrasives are far more toxic than whatever minute amounts of silvering medium (of any make up) are involved. But that's what your respirators and dust removal systems are for, yes?