Reddit reviews Sodium Metabisulfite Food Grade/Photo Grade 98.6+% Purity White Granular Solid Crystals - Choose Size
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Food Grade / Photo Grade, 98.6+% Pure, White Granular SolidCommonly used in Beer & Wine Making - Preservative & AntioxidantPackaged in an HDPE Plastic bagHigh Quality - Fine Granules - High PurityPure White in Color
Hungry Jack and Golden Grill, as quick examples off the top of my head, use sodium bisulfite and BHT to preserve color and prevent oxidation.
Some practical advice to using these in the kitchen:
Sodium bisulfite is easy to find (it's used to keep dried fruit from browning and in winemaking) and usually recipes call for an ounce for every 15lbs of potatoes used in the recipe but you can experiment to find the sweet spot pretty easily. Broadliners usually carry it under additives/preservatives or you can get it bulk from restaurant supply places really cheaply.
BHT is not thermally stable, it's used in dried potato flakes and other products so it remains the same in the box for decades. It has the least thermal resistance among synthetic antioxidants and has also been getting some bad press or bans in some countries. It's harder to source and you'd use 0.5g or less (I think the FDA limit is 0.02% by weight) in your 10lbs of potato recipe, probably mixing it into the milk thoroughly.