Why butter becomes sour when kept outside for long times in summer

1.	Why butter becomes sour when kept outside for long times in summer
Answer» Butter becomes sour if kept in summer for long time due to rancidity I.e spoilage of food\xa0Butter and oils will go rancid if exposed to light, heat or air. For this reason oil should be kept in a cool dark place( when in bottle ).\xa0As during summer there will be Hugh amount of heat , rancidity takes place and they become sour

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