Related Articles Why Did My Nickel Agarose Beads Lose Their Color? Ni2+ ions give nickel agarose beads their characteristic blue color. This blue color can fade or disappear completely when loading his-tagged proteins onto the column.... Read more Why Did My Nickel Agarose Beads Turn Black or Brown? Nickel agarose beads change from blue to a brown or black color when the nickel ions have been reduced from a Ni2+ to a Ni1+... Read more Featuring the Coolest Floating Tube Rack Creations The GoldBio Floating Tube Rack is one of our more clever giveaways because of the unique purpose it serves. And, with it also being one... Read more Why Are Nickel Agarose Beads Blue? The characteristic blue color of nickel agarose beads comes from the 2+ oxidation state of the nickel ions. Color is also a useful indicator for... Read more