How do I maximize solvent extraction !?

What up !!!
So I made some extractions and when I was done I could still see crystals on my buds ! No good lol
I run a 20 inch glass tube open ended with 3-420ml can of butane roughly 3.5 ounces fits in the tube any help would be great thanks !!

You can run 4 cans or repack the tube and run it again.. You never get it all...

Ok so if I see there's a ton of crystals still it won't hurt to run again I wasn't sure if I would be wasting butane or not , also I have cleaned and saved a jar of isopropyl alcohol with a ton of wax suspended in it I don't know how to recover it could you help there

These are results from my first try at it

But I had a color variation in some of the runs I wasn't sure why

1 can per oz seems to be what ive read as well (no experience) so 3.5 oz would need 3-4 cans. Again, I am not a pro.

BRANDON77 said:

1 can per oz seems to be what ive read as well (no experience) so 3.5 oz would need 3-4 cans. Again, I am not a pro.

Click to expand...

Yeah I'm running 300ml per ounce

I ran this stuff for a couple years and every run came out different.. color, consistency, taste..
My best returns came from a fairly heavy pack and a slow release of butane.. shoot half a can wait twenty seconds then shoot again.. Gives it time to work.. A buddy of mine grinds the weed then re-packs for a second run.. This link should help... https://skunkpharmresearch.com
Also butane only extracts trichome heads not the stock.. You have to look for heads...