Thanks for the reminder CoachBob, medical grade CA is very different, being as you mentioned ethyl based products. Most of the commonly available CA's that we use are methyl based versions, which while fine for general use, are unsuitable for medical use. The main problem being that when they break down in tissue, they break down to form formaldehyde and other compounds, which are toxic (duh). True medical grade CA's break down harmlessly as mentioned. By the way, I believe that it was FFW that had a great little article recently on shop medical kits, and there was a great little tutorial of how to use CA for wound closures.