High Sugar and Solids
Q: Could an Idaho russet potato with high sugar content still have high solids?
Yes, the potato can have both. The make-up of a potato is a ratio of solids (also called starch) versus water. So refrigeration that's too cold will not change the water content upwards. What it will do is visually make the potatoes turn dark brown or caramelize before they are actually fully fried or make a baked potato taste sweet.