Hi, I'm kind of new to painting with oil, this is only on my third painting with Geneva oil paint and I'm having a weird issue. Dark spots are appering! I started this painting yesterday and by last night I saw these dark spots coming up through my paint. Especially in the background. This piece is done on a generic 8oz Prime 8 x 10 canvas panel. I primed it with Geneva Foundation canvas stain two days before beginning this painting. The colors I am using are only titanium white and burnt Umber &


French ultramarine to make black. If anyone knows what's wrong, please let me know. But the pictures not done so please don't judge. LOL
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Welcome to the DMP Forum.
Possible causes:
Poorly mixed paint. Mould. Contaminants. Support induced discolouration. Finger prints.
Judging by the shape and location of the dark areas finger prints seem to be the problem.
The chemistry of finger prints could cause weird adhesion/reaction effects with the pigment/medium constituents.