I would highly recommend searching for previous auctions/sales/scans of ANY error/freak of this type (missing colors) online before bidding. You should be able to find examples of most quite easily. Any "new" examples should be suspect and checked thoroughly. Any fading or unevenness are red flags. Look for clean, bold colors (yellows, browns, pinks & reds)
Feel free to ask on here first, most likely any oddity on eBay has been seen by the usual error collectors.
