Good job Andy! I like HDC because it's simple to make and works as well for me as the HD version did. The only thing I noticed was that HDC seemed slightly more energetic. I really never noticed much if any difference in resolution/sharpness or grain in my 120 negatives, but then I never really looked that close. I was just happy with what I got and never pushed further. Oh, the keeping qualities seem exactly the same also. Mine is in glycol so don't know about water mix?