
Everything seems to be straight forward, and JC confirmed there is no "luck" involved.
It is apparently possible to receive dross instead of blister steel, which is possibly related to:
- additional time the finished coffins stay in the (still lit) furnance (?)
- additional time passed after the finished (and taken out of the furnance) coffins cooled (?)
Please help gather any and all useful information regarding the process of making blister steel in this thread, and I will try to compile it into this first post, so everyone can see it more easily.
1)...how long does the furnance need to go, to produce blister steel?
- probably 7+ days
2)...how much fuel (coal?!) is needed for that?
- no coal needed, use branches!
- re-fuel once every day to stay on the safe side, seems to be burning for ~2+ days with 100% fuel
3)...the blister coffin is listed under tools, does that mean it is re-usable?
- probably not, no real info on that one yet
4)...is the coffin ready to go as it is, or are there more things to do?
- nothing can be done with the unburned coffin, as far as I can tell
5)...after the coffin is "well done" in the furnance, what else is to do?
(It states on the coffin it becomes usable after heating in the furnance, so I assume there is more to it.)
Nothing! Just take it out of the furnance after reaching 100%, wait for 1-2 days and you can loot the bars off the coffin.