When I was at Wild Turkey last week I noticed that after several days of fermenting the top layer on the tanks was VERY thick and lumpy. I asked Jimmy Russell about this and mentioned that I had never seen the fermentaion so lumpy and thick at the top before at any other distillery. There is usually a layer at the top, but this was many times thicker and lumpier than I had ever seen. He said is was due to their mashbill. I asked if he meant the high rye content and he replied yes.
The next day I was at Four Roses and was expecting to perhaps see something similar due to their high rye usage, but their fermentations all looked pretty normal. (Unless all the tanks were fermenting the low rye mashbill that day.)
Has anyone else noticed this and have a further explanation? Chuck?