What are these "green" like stains? Removal process??

I am currently sanding my kitchen table (orbital sander-level 4- 80 grit paper) ive been at it for about one hour now and I was preparing to move to the next section but I can not get these markings off the table. I am planning on staining the top (veneer) with homemade acv and steel wool stain when all is said and done. Any suggestions.....
q what are these green like stains removal process
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