Steel doesn't know what is getting it hot, gas or coal. The damage can come from overheating the steel with either. Sulfur in coal can cause problems with a forge weld, but as far as introducing anything into the steel from the fire, that is next to impossible. I would recommend you read some material on metallurgy and disregard a lot of the "alchemy and legends" that pass for factual information in the knifemaking world.
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