SEARCH Articles Figures Tables Acceptor Doped Metal-Free Phthalocyanines Copper phthalocyanine blue metal-free pigment Free metal Metal phthalocyanine Metal phthalocyanines Metal-free Phthalocyanine Blue Metal-free copper phthalocyanine blue Phthalocyanines metallation Phthalocyanines, metal free Phthalocyanines, metal free Phthalocyanines, metal free metallic Phthalocyanines, metal free metallic X-form metal-free phthalocyanines