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Enzie:
Am a little unclear if you intend to continue on this work or start a new work over it.
My baseline advice is that if you are suspicious of the stains on the back and the overall quality and survivability of the canvas, then you would do well to abandon it for a new canvas and begin the work again. If the oil has gotten to the fabric on the back, then it will rot it away over time.
Also, if you plan to start a new work, then definitely don't use this canvas as eventually the work underneath will show through. That combined with the stains on the back...new canvas.
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