I fermented my first beer with my SS Chronical and the krausen left a very difficult krausen stain to remove. Ive fermented with glass carboys for the past 2 years and never observed the krausen form a black edge at the top of the krausen line or a pink hue in to it as it did in the SS chronical. The chronical was cleaned with TSP as instructed and soaked in starsan for 20 minutes per instruciton prior to its first use. Any ideas or suggestions from those who use SS fermentors? thank you in advance.