If I would have done one from scratch that is the way I would have done it.
Several years ago, Frank Decmar, from
The British Araucana Club solictited real dried egg shells to come up with the chart many of us have today. The Araucana Club of America used it too, featuring their club in the center. Rather than reinvent the wheel, as they say, a few years ago I designed a center for the ABC and Frank worked with me to customize a chart for our club. Now with the new club name I've worked with Frank to do it again. The German and/or Australian Araucana clubs may be using them also.
Keep in mind these are only intended to use as references for people around the world to tell what egg shell color they have or want.