Why Did My Ni-Agarose Beads Turn Black or Brown?
Ni-agarose beads are typically blue due to coordination complexes between Ni²⁺ and the immobilized chelating ligand. In purification systems containing reducing agents, metal reduction or drastic changes to the coordination environment can shift the bead color from blue to brown or black.
危险品化学品经营许可证（带存储）