The inside of a potato is usually a translucent white, a large mass of undifferentiated starch. However, some varieties of potatoes are a very pale tan or yellow.
The potato is a large root (tuber) made of starch stored by the potato plant. It is designed to feed the "eyes" or sprouting nodes that would re-emerge when spring comes.
Potatoes are a leafy plant (Solanum tuberosum) which produces a starchy edible tuber which are also called potatoes.
Brown - skinned potato tubers, followed by red, are the most common colors, but...