Is this normal
or is Rosie contaminated? I have just made a Yeast water dough with my raspberry YW Rosie. It is a bit scummy on the top and on the glass sides, smells good, isn't murky but I wonder if this is the way it goes as it matures? The poolish I made is bubbly and smells good too so I went ahead with the dough, but I wonder. here is a side view.
Any tips, guidance appreciated
Leslie