@SixthColumnist @Spivonomist all I can say is that borax does indeed eat the refractory in my Forgemaster http://www.centaurforge.com/Forgemaster-Blacksmith-Atmospheric-Double-Burner-Forge-Eligible-for-Free-Shipping-See-Home-Page-for-full-details/productinfo/FORGEB/ …
@Spivonomist @SixthColumnist and before you ask "why that and not something else?" - bc that's how I was trained http://www.prospecthillforge.com/