Fresh dunder?

[Sailman]

OK about a month ago I started some a batch of pugirum. I followed the directions as close as I could with what I could find local. I'm trying to get enough to fill a 5 Barrel. I did 4 -10 gallon fermentations that wound up being 4 stripping runs and 2 spirit runs. Fresh dunder was kept from all of the runs and add it back to the next ferment. A combined 2 stripping runs to dopen runs to do one spirit run and added equal amounts of dunder to the still. Yesterday when I did the spirit run opened up and I opened up one of the buckets with dunder in it and this is what I saw. Is this the start of a muck bucket? I was unsure if this would be safe to use so I did not charge the still with it. It looks similar to some of the pictures I've seen here but something that I'm gonna drink I just wanted to make sure before I before I use it.

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