If you are truly looking to extend shelf life then making FECO and adding it’s own weight in Pharmaceutical/Food grade Glycerine is an option.
Final storage in a UV resistant dropper bottle or such should extend shelf life greatly. 
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Seems a little exotic. I grew some Afghan #1 I didn’t like. So I put it in a baggie and put it back in the dark. 3 years later I found it and it was much better-very hashy. YMMV
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liposomal vitamin C
6-bap (i dont use this past week 4, but brocoli is hit with it and sold).
Oxygen and heat reduces shelf life.
Nothing to do with nutrients.
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Okay everybody buckle up tight for this highdea…
Supposedly honey is the only thing that lasts forever- source unkown and unverified
If you could thin out honey for a hydroponic base and add PKN as needed…maybe MAYBE MAAYYYBBBBEEEEE…after a few dozen generations…the shelf life could improve
BUUTTT i doubt that would happen.
Any highdeas on how to make weed glow in the dark??
(Sorry didnt mean to change the direction of the thread)
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As a welder and fabricator…im borrowing that last sentence!!!
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