A Chem E relative of mine who worked in the Pacific NW in a plant where they
made Vanillin out of some tree byproduct related that they cooked the stuff in
big vats before processing. Had for a long time. One day an old guy that
worked there took a prolonged vacation and soon the brew started developing
more and more foam that ran over everything, so much so that they had to start
using smaller batches. He came back and was quickly surrounded by quality
control to see what he did. The batch started to foam so he reached up on the
wooden wall, pulled off a little tar paper and threw into the mix. Foam
stopped. When asked why he did that he commented that years ago he saw a bit
of the stuff fall into the batch which stopped the foaming so he just always
did it that way. Undocumented, luckily!
Sorry for the OT bit. Such would never happen in a science based hobby like
ours.
N0UU
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