my problem , I did alot of recipe (60ml) maybe 8 bottles (all recipes from ELR high rating) , after 2 week it is very good , then after 1 or 2 month it smell very good but make bitter or chemical aftertaste that make me back to smoke , all recipe bitter
now I made another bottles (60ml) and steeped it for 2 week it is very good now but I know it will change to bitter like all times .
last batch I added 2 drop of (MTS FA) per 10ml on each recipe, I want to try if it will work or no .
I dont know what is the reason , if it Ph or flavours gone old age !!!