1st I take no responsability for anyone trying this, if you do it do not smoke around it and use a well ventalated area.
How to make ISO has,
Get the best rubbing alchole avaliable target carries 91% fred myers carries 99% mix stims bud and scrap togther mix vigorusly for 1 minute some people say less I think the longer the better.
Find a glass baking pan to dump the rubbing alchole on, now you need to wait for evaporation or use a blow dryer to move it around untill it has evaporated.
Use a flat razor blade to scrape up the matireal left over you can do this 2-3 times with the same material just rember each time it will be a diffrent potiency.
I used 11.5g of junk stems unsmokable mateerial and some 99% alchole and got 1.6 grams of killer hash smells great melts like it should and really only need 2 good rips...