Location of Li-rich giants in the IR color–color diagram based on only IRAS flux densities (Fig. 3a) and flux densities taken from both WISE and IRAS (Fig. 3b). Li-rich giants from this survey are shown in triangles, and those from other studies are shown as circles. Red, blue, and black colors indicate good, moderate, and not good data, respectively. The size of the symbols represents the amount of Li, 1.5 ≤ A(Li) < 2.5, 2.5 ≤ A(Li) < 3.3, and A(Li) ≥ 3.3. The red square denotes the Arcturus, a typical K giant with A(Li) < 0.0.