Castor is the dominate color but is very difficult. There is a lot of variation in the color even with "correct" color. There are lots of factors that go into the mix to make a good castor color like rufus modifiers, band width, and amount of tipping. Personally I like a heavier tipping with a wide, high rufus mid-band. That combo produces the perfect Castor color for me.

Judon's "Fred" Thank you Don & Judy Atchison. A_ B_ C_ D_ enen
AMS Rusty Thank you Amanda Shelton. A_ B_ C_ Dd enen	Judon's "Ginger" Thank you Don & Judy Atchison. A_ B_ C_ D_ enen