Glass mixtures based on turquoise blue glaze were synthesized by the conventional ceramic method, and their color properties were investigated as environmentally friendly Co-free inorganic blue pigments. Samples showed coloring from light blue to black depending on their compositions. The bluest color was observed for 0.60 BaO·0.20 Li₂O·0.20 Na₂O·0.45 Al₂O₃·2.50 SiO₂ in a 20 wt % CuO sample heated at 900°C, which had the following color parameters: (L*a*b*) of L* = 41.9, a* = −4.5, and b* = −14.2. The a*, b* values are comparable to those of commercial Co-based blue pigments. Since the glass mixtures do not include cobalt oxide as a raw material, it should be an attractive alternative to conventional Co-based inorganic blue pigments.