Yoo this was indeed something which I measured O:

I dont completely understand this

xD

But it was somehow like this:

The process was somehow like this, calculated upwards to 1 kg bark

1 kg was cooked 2x with 4 L per kg bark

then all L were combined and reduced to 1 L per Bark (this is a pretty high concentration in the end - therefore I guess it is that high yield within the very first pulls).

Then all 3 pulls were done with 1:5 Naphtha:Water, but with Hexane/Pentane-Naphtha (40/60°C), and not with Hexane/Heptane-Naphtha (60/80°C).

This way it is already pure enough for the direct usage.

BUT

I have a new result where I did not concentrate the soup that hard and this time there was still something to be pulled out when I additionally threw 60/80°C on it, after I did the 3 pulls with 40/60°C. Therefore either its not really repeatable or the three pulls that gave everything mostly relied on the hyper concentrated soup. Don't know, but I will soon start some tests about solubility in 40/60 + 60/80 and also how the pulling process is when you pull X g out of 1 L and X g out of 2 L in terms of efficiency ... ;O