I brewed the NB Kolsch 6 weeks ago and had the same crazy fermintation. It was EXTREMELY active, I ended up having to use a blow off tube for a week or more. It also ferminted a lot longer than most of my others, I ended up leaving it in the carboy for a month before I started getting consistent hydrometer readings.
It's only been in the bottles for two weeks, but the last hydro sample I tasted was pretty good. I will probably brew the honey kolsch later this year just to see how the addition of honey affects the final product.
The Kolsch yeast does give off some "sulphery" smells during the fermination, but according to what I've read here and the yeast profile from Wyeast, the "sulphery" smell is expected.
Conditioning: Chris Colby's PM ESB, English Bitter with all the wrong hops, Kolsh
Drinking: NB Fat Tire Clone, English Pale, California Common, and NB Tongue Splitter
Last edited by Money Pit Home Brew; 03-20-2008 at 03:22 PM.