Good to see ya here man... Yes. Many
Tek's are junk for various reasons.. lots of amateur Kitchen Chemists out there
I mean, let's take your Tek for instance. What are you saying here ?? "
1250 grams TFH left overs", plus
200 proof Ethanol, plus vinegar... WHAT??
That's your Tek?

Or just rambling here... "
Slow Cook for 5 days at 208 degrees precisely" OK... and, what IS the boiling point of Everclear? Should people even TRY to heat pure alcohol on the kitchen stove, 2 degrees below boiling and possibly...
Risk burning their house down ??
Yes we agree.

There's a LOT of junk Tek's and a LOT of junk Advice, on the Internet.
P.S. That's NOT how you make Kratom Extract. I've got over a dozen good Tek's from various sources. Many with
Full Instructions, not just ramblings... There IS a guy on Facebook, Ben, who knows his stuff (FB is impossible to "Search" however) you can "Search" on Reddit over 7 years of Recipes. Avoid the Shulgin's tek or any A/B Extraction with toluene or other harsh chemicals... A decent Kratom Full Spectrum extract can be made with water & ethanol, very similar to Caleb's FSE. However - To make Caleb's Co2 extract, or Caleb's Pure Alks, or Mobo Pure alks you need Lab equipment cannot do those at home!