Our NanoNews Digest Sponsors Home > Press > Nanomaterials researchers in Finland, the United States and China have created a color atlas for 466 unique varieties of single-walled carbon nanotubes. A color map illustrates the inherent colors of 466 types of carbon nanotubes with unique (n,m) designations based on their chiral angle and diameter. (Image courtesy of Kauppinen Group/Aalto University) Abstract: Nanomaterials researchers in Finland, the United States and China have created a color atlas for 466 unique varieties of single-walled carbon nanotubes. Nanomaterials researchers in Finland, the United States and China have created a color atlas for 466 unique varieties of single-walled carbon nanotubes.