> I was also told acidifying the water with white vinegar helps separate the 
> impurities.

The reason for acidifying the water is to neutralise lime.  If you have soft 
water then you do not need acid; however, if you have hard water, i.e with 
lime in it, then boiling wax in the hard water will cause the wax to react 
with the lime to produce a soap - ruining the wax.  By adding acid the wax 
is protected from reacting with the lime in the water.

Best wishes

Peter 

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