Originally Posted by
Macybaby
mildew would normally not just be in one spot - meaning you should also see some where it was touching the next layer on the roll. If you don't find any evidence of that, I'd figure it is more likely a dirty spot that got there when it was being rolled.
I buy almost all my batting on roles, and have found dirty/damaged spots occasionally. Most often I set the piece aside for a smaller project, and cut a new one.
Thank you for your input as well!
There are spots here and there - it has many characteristics of mildew except I studied it in the morning light and it looks like a dirty area.
I tried blotting one small area with vinegar water and the only thing that happened is it looks more clearly like a stain from manufacture.
Since I often do quilt-as-you-go and use small pieces I decided to put the piece aside to cut around the dirty area later. I just cut a new piece for this quilt and it's all nice and clean.