First, Virginia ham is cured with Sodium Nitrate and Sodium Nitrite, not with Borates! Again, chemicals are being mixed up and this mixup can cause a deadly accident if someone tries to make their own cured ham.
Second, Patrick, I read your posts, you did not read mine. I said that you could concentrate impurities in BOTH the solid Borate that does not dissolve and in the saturated liquor.
Kirk has described a sound laboratory method above. I described a scenario which you obviously did not read or understand in any way. It is a hypothetical case illustrative of what I'm saying to you.