Why did my SnO sample change color from black to light yellow in the desiccator?

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The discussion centers around a PhD research scholar who prepared a black SnO (tin(II) oxide) sample, which has since changed to a light yellow color after being stored in a desiccator. The primary concern is whether this color change is due to oxidation. Oxidation is a plausible explanation, as exposure to air can lead to the formation of tin(IV) oxide, which is typically yellow. Other factors that could contribute to the color change include moisture absorption or contamination. The scholar seeks insights into the chemical processes that may have caused this transformation in the SnO sample.
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I'm PhD research scholar, I prepared SnO sample of color black and kept my sample in desiccator some days back. But now it is converted into light yellow color. what might be the reason? any idea?
 
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