Why has ZINC SULFATE 0.1M Gone Cloudy and orange/yellow?

Gadget

New, Lone & supporting KS3-GCSE all 3 subjects.
Morning All

Please be kind, not a Chemist, just got some some 0.1M Zinc Sulfate solution out and its gone cloudy yellow/orange.

Just wondered why? Contamination?
 
It's probably precipitate of zinc hydroxide or zinc carbonate, so it either got contaminated somehow or it could be CO2 leeching inside the bottle if it's an old solution to react with the the zinc.
 
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