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Nice image H. Good colour and lovely field of view.
Re the dust. Do you mean the dark band that travels along the nebula to the left which also encompasses the globular?
I think this is just an absence of dust and hence why it stands out. There is dust over the entire frame in your image and where there is an absence of that dust it stands out.
If on the other hand you are referring to the dust just immediately left and right of the dark dust then, this is a common feature and seen in lots of images, though only those that are deep. It's well seen in my recent image of the area. Though I suspect this is not the dust you are referring about.
In any event, a lovely image of this object.
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