The best paper for origami is called "Kami" (the Japanese word for origami paper), the standard origami paper. Kami comes from Japan in factories that have been around for generations and have staff that have honed their skills over many years. They start with white base paper and ink or stamp various colors and designs onto it depending on the type of origami paper being created. So one of the feature of the Standard origami paper is that it has color on one side and the other side is white. Uncolored standard paper (or a pure white sheet) is .066 millimeters, paper dyed on one side (like every sheet other than white) is .071 millimeters thick.