Why does the Pasuk write "Yerakrak" and "Adamdam", instead of just 'Yarok' and 'Adom'?
Rashi: Because the color the garment becomes is deep yellow
and deep red.
Rashba (Nidah 19a): Stam 'Yarok' is [yellow,] like wax (Tosefta 3:3). Green is called Yarok k'Karsi (like leeks).