Mamee Double Decker, a Thailand-based snacks and drinks firm, has announced the launch of new sweet potato crisps in its home market under the Mister Potato brand. Mister Potato Sweet Potato Crisps are “naturally purple”, a phenomenon that is said to derive from the natural colours of the purple sweet potato itself. According to a company press release, the new product is “addictive” with a “delicious, sweet taste” and is …