It took awhile to find it but Sibley had a suggestion about color gradation of Redpolls back in his blog in 2008. It is still online at the following address:
http://sibleyguides.blogspot.com/2008/01/character-index-for-redpoll.html
The illustration can be enlarged and gives some food for thought. Of course I am probably the last person on the list to discover this site!
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