We did an experiment in college where we used ion exchange chromatography to separate a mixture of cytochrome c and katalase. The experiment was succesful, we could clearly see the 2 separate components afterwords. But we had to do a test to make sure it was cytochrome c in 1 test tube and katalase in the other. For the cytochrome c, we added a little Na₂S₂O₄, and the color turned bright pink, so the test was positive. We are supposed to explain what caused the change in color, and I just can't figure it out. Is there anybody who can help me?
Thanks a lot in advance.