One problem I find when people discuss using sand as a flux is there are many types of sand, problems also with inclusions, where it was stored etc
One very well experienced blacksmith I know swears by rock, crushed up obtained from a range of local hills near to his smithy
Borax has been used for many many years, and is relatively easily available and works well.
So try different compounds, and ff it works for you, then go with it.
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