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Cobalamin complex

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I have my final report and I have 2 questions about it. So our final product was a brown crystalline solid that had an absorbance at about 880nm. My first question is how is brown reflected (not in a literal sense) in the visible spectrum? that's outside visible region and I could find nothing about brown solids and absorbance in my book or online? My last question is why were having a steady stream of oxygen to the first part? was it to act as an oxidizing agent to cobalt?

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Solution Summary

The reason for the use of O2 in the preparation of cobalamin complex is given. A discussion of identifying brown solids in the absorbance spectra is also included.

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Brown is a very interesting color. It is formed from a combination of other colors and hence can go somewhat past the traditional ...

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