Have made a knife out of an old semi spring and did a hand filed profile on the blade .  Once I heat treated it I ended up with this scale paternity in the steel 

It is possible to make steel from scale, as scale is a high grade ore---magnetite.

Was there a question about the fine "bubble" pattern often seen on quenched items?

Yes did this happen because I did not brushes it off between the coal forge and the veggie oil or was it a temperature issue ?

 

more of a "It happens with quenching" sort of thing.

Ok think I found an answer in þh blade form too much o2 while heating to temp so I will try a higher banked coal fire and easy on the air so if that helps thanks 

Or use a piece of pipe for a muffle with crushed charcoal in the bottom.

I will have to try that  thanks 

 

5 hours ago, Sk Bjorn said:

I ended up with this scale paternity in the steel 

Yes, quenching is definitely the father of this effect. 

so was it how I quenched or my oil temp when I quenched  I thawed the oil  then dropped two hot rr spikes into it to heat it up before I quenched  but the knife barely fit so I could not move it up and down much  using a àmo box for my quench tank  

 

It is a rather nice patination effect to my eye. I would be happy if one of mine turned out that way-unless i was looking for a different finish of course. Would it have any detrimental effect to the strength of the blade? If not it would be a keeper to be repeated for me.