I took the iron I already smelted and re- smelted it. The iron was old and rusty from forging experiments. Iron oxidises faster when in the forge due to the hot and oxidising conditions. So I tried smelting it again to turn the rust back into iron. The first attempt involved charging the iron into a furnace in a single charge. The results were mixed, the iron was in separated pieces though the iron was softer and could be slightly cold forged. Next the iron was included in an iron smelt with fresh, roasted ore. 3 charges of ore were charged, then the scrap iron and then another 3 charges of ore. The result was cleaner but the iron was still in separate pieces.