What is the reason that some American football balls are brown/tan

How Different Are Dogfighting and Football?

How NFL footballs are made

Why are footballs made with a combination of hexagons and pentagon

Are footballs made out of pig skin? - Quora

Why are footballs brown when it makes the ball so difficult to see

Pro Football Journal: Fifty Shades of Brown?

How many bowls (football) are there? - Quora

Ball (gridiron football) - Wikipedia

Why are some balls used in sports oval shaped while others are

Wilson LABS - GST Prime Football