From the fire
Six things the fire taught us that the books did not
Most of what is written about forging is written by people who forge occasionally. These are the things that only show up when you light the same hearth every morning for twenty years, in the order we learned them.
Sparks mean you have gone too far
A bar throwing sparks is burning, not welding. The books describe the colour to look for; nobody tells you that by the time you can see it clearly in daylight you are already past it. We forge with the shutters half closed for that reason alone.
The fire is a tool and it wears out
A hearth is not a constant. Coke breaks down, the fire pot clinkers, and the same bellows setting gives a different heat by mid-afternoon. A smith who blames the steel has usually not looked at the fire in three hours.
Work in the dark, judge in the dark
Colour is the only thermometer that matters and daylight lies about it. A workshop bright enough to read in is a workshop where every heat is guessed high. Ours has one window, deliberately, and visitors always ask why.
Listen to the anvil, not the hammer
The ring changes before the shape does. A bar going cold gives a duller, shorter note a stroke or two before it stops moving properly, and you can hear it while you are still looking at something else. Apprentices learn it by having the lights turned off.
Tidy benches make slow smiths
Everything you will need in the next ninety seconds should be inside one step, because that is how long the heat lasts. A bench that looks organised to a visitor is usually one arranged for photographs rather than for work.
The last heat is where tools are lost
Almost every ruined piece is ruined on a heat somebody took because they did not want to stop. The discipline is not in the forging; it is in putting a nearly-finished thing back in the rack and going home.
What it comes to
None of this makes a better tool on its own. What it does is remove the six ways we used to make a worse one, and that turns out to be most of the job.