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DOS= dreaded orange spots, aka rancidity. It can be caused by oxidized oils, exposure to sunlight, and exposure to metal or other contaminants. Your soap should not be in contact with any metal other than good quality stainless steel.
 
What's DOS?
You can search online for some images to get the idea ‐ there are plenty and it's hard to be mistaken with something else most of the time. Those orange spots can even smell like rancid oil if they get bad enough
 
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