there is an ancient spell that will help you:
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i'd note that there's zero technical reason why DEG would end up in PG. reaction of water with ethylene oxide gives you ethylene glycol, diethylene glycol and higher analogues and these are then separated by distillation. propylene glycol is made from propylene oxide instead, and it's more expensive than ethylene oxide. diethylene glycol has little use on its own, at least compared to other glycols
however,