Your copper peptide product should be this exact blue. If it isn't, you already have your answer. GHK Cu is blue because of coordination chemistry, not dye. The Cu ion at the center China Copper Peptide(GHK Cu) CAS:89030 95 5 Manufacturers Free Sample Alfa Chemical GHK Cu: Regenerative Signaling and Molecular Reprogramming Research English Version Peridico Digital Centroamericano y del Caribe Influence of Coordination Geometry upon Copper(II I) Redox Potentials. Physical Parameters for Twelve Copper Tripodal Ligand Complexes Inorganic Chemistry