I mentioned before how much more allergic I am to Sheba, who is black, than I am to Red Cat and Purdy, who are orange. Someone mentioned that she thought dark colored cats produced more allergens than lighter colored cats. I can't find that thread now. (It was probably one of those lost in early December.) But I thought I'd share the summary of some research I found on the topic.
http://my.webmd.com/content/article/30/1728_70265.htm
http://my.webmd.com/content/article/30/1728_70265.htm