Sylvania 175watt Mercury Vapor Clear Bander

Here is one of my finds from the day 5-5-2012. I went to a local restore and found many NOS mercury vapor light bulbs, in which I took all of them, and some other things too... I was amazed to find these new clear banders for $2 a piece! The bulb to the left has its etch fading away, it rubs off really easy. The one on the bottom is the bulb etch pictured in the upper right corner. Any ways of keeping the etch from rubbing off?