What are the differences between redshirting, grayshirting, blueshirting and greenshirting in college football?

There are a lot of 'shirts in college football. Here's what they mean.

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What are the differences between redshirting, grayshirting, blueshirting and greenshirting in college football?

What Does Redshirt Mean? And The Reasons Why Players Do It?

lanthanum פרמטרים מקומט red blue shirt משל קליבר סמן

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what does a blue shirt mean in college football

In college sports, what does 'red shirt' mean? - Quora

Redshirts, Grayshirts, Greenshirts, and Blueshirts

The rise of grayshirting as a trend in football recruiting - ESPN

Redshirts, Grayshirts, Greenshirts, and Blueshirts

What are redshirts, grayshirts, blueshirts and greenshirts in college football? - Quora

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National Signing Day 2016: Previewing Illinois Fighting Illini football's latest recruiting class - The Champaign Room