There are those working boro that swear the extra purity of bottled oxygen can make a lot of difference in how the colors play for you in hard glass.
Welding oxy tanks run to 99.9% purity versus the 90 to 95% you will get out of oxycons on their best days. I don't know at what percentage purity oxycons will set a low purity alarm at. It might be as low as 85%.
I bet Shawnette would know.
Maybe someone experienced in boro and tanks will chime in about the difference between sources.
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