I've been drying roughed bowl blanks in DNA for a couple of years with great results - as long as you keep your DNA fairly fresh. Because DNA is miscible with water, the water from the wood dilutes the DNA, and it becomes less effective over time. I didn't realize that until I noticed that the bowl blanks started to take longer and longer to dry. Then I found a thread at AAW had a link to an explanation. The link is "http://alcoholsoaking.blogspot.com" and then click the "determining alcohol percentage" link. In that page, it mentioned that the alcohol percentage should be at least 60%, and when I measured mine, I found it was only about 15%. Needless to say, my alcohol soaking was just about useless at that percentage. I now have a new supply of DNA.
Scott