In my quest to figure out this digital challenge, I went to an old film trick.
I highly recommend spending the 5.95 to purchase a "Kodak Grey Card", especially if you use PhotoShop or another imaging software that lets you store White Balance levels. The color adjustment is a no brainier with this tool.
Kodak Grey Card
If you have ever been to the Post Office museum in DC, you might wonder why it is not on the wall with the clothespins. When first opening the envelop, I thought it was a piece of cut Matt board, but the board is to photographers specifications.