Faint block stamp

[CT Mark]

I have a numbers matching 66 SS. The block stamp is very faint. You can see the vin# quite well. The T+date is very faint and the "EJ" and "Z" (for Fremont) are VERY, VERY faint.

The EJ & Z are only visible in perfect light and at the correct angle. I have not been able to get these to appear in a photograph. I'm not sure if there's any depression left from the stamp. There's probably just a variation in the metal that makes it visible. I had a friend that is a professional photographer look at it and he said it can't be photographed unless something can contrast it and make it pop a bit. I've tried to use a very light coat of paint and rub away the excess and this did not help.

Does anyone have any suggestions? I really just want to get it visible, snap a few pictures and leave it alone. I also don't want to use the acid as I've heard that it's lost forever after the process.

Thanks, Mark