Hi Deadeye,
I'm trying my first oxalic bath as we are talking. The helmet is soaking now. On a bit of a macabre note, it appears I have found some of the warrior's hair where the shrapnel came in. I know the whole blood rusting issue is suspect, but I will let you Guys be the last word. I have put the man's hair in a small clear packet. The first dip of 20 minutes has brought the crown stamp out very clear! Also, I believe the helmet had a cloth cover which appears to have burned to the helmet. It was not clear initially when handling the helmet. Perhaps body burning at that time? Interesting I think. My wife was taking pictures while I had my gloves on, so hopefully they are clear enough. Back soon. Still roasting in the acid so to speak.