A few years ago, when I couldn't find detailed information regarding the colors and date periods Jasperware has been produced in, I compiled my own guide - these pages are the result of my research.

The Color & Date Guide covers solid and dip pieces and is a handy reference for collectors.
The History section contains a Timeline of Events & Production Summary.

Also, a Decoration and Types of Ware Chart is available on this page too!
New color samples have been added, and some exisiting samples have been updated to make this Color Chart even more useful.