That one was a sample knitted for me by one of the ladies helping run the list. I dug out her email about it, it mentioned the yarn type but not the color. So I emailed her asking her about it. If I hear back I'll let you know.

I'm glad you like the pattern. It's ironic - I had seen an article about a pattern in Weldon's Practical Needlework using that stitch pattern as a wrist cuff. I figured it would make a good sock. My mother gave me two new sock books for last Christmas, including one where everything was based off sock patterns in Weldon's - sure enough, there was a man's sock using the fluted banister pattern!