You may really want to thank the Chap in England that created the chart first used for the UK Araucana club, the American Araucana Club and the Ameraucana Club have them made and purchased directly from him.Thanks to the Araucana club for their excellent egg color chart, it is so useful - I ran a little egg photography experiment that had interesting results, look here if you would like
https://www.backyardchickens.com/t/781600/blue-eggs-true-color-photography#post_11204052