If you want to make flour from the bark, or just save it for later, the next step is to process the bark by drying it. Drying the bark in the sun on a rack or on a flat rock is your best bet, if you are not using the bark right away. It should take about a day to dry the bark strips, depending on the weather and the bark strip size. Once dried, you can create the fabled pine bark flour, which actually resembles oatmeal more than wheat flour. If you want to go old school, you can grind up the dried bark between two stones, but a faster way is to drop pieces in a blender or food chopper. Pulse the device to powder the bark, and then store it in a cool dark place.