I thought we could start a thread and list off the good to go brands of butane that we know are ready to be used to make our lovely oils. What to look for on the bottle when you are checking an unknown brand: A label saying "near zero impurities" it written on the bottle that is is 50 ppm or less impurities The mirror test: This is a standard test you can do to see what level of impurities you have in your unknown quality can of butane. 1. Spray the butane (a 1 second blast or something short) so that it blasts onto a mirror. It will spray a rig on butane on the glass and go white. 2. Wait for the butane to evaporate into the air. now look at what is left behind on the mirror 3. If you see any discoloration/white rings these are the impurities (make sure you clean the mirror first of course right?) Note: Now I recommend you try this with an accepted can of butane too because they do not leave invisible marks either. there WILL be some residual on the mirror even with these types! So I suggest you try it with 2 cans (One you know is good to go and your tester can of fuel) so that you can fairly compare and judge for yourself. Brands that are acceptable according to users here on FC: Colibri London Newport Silver Match Vector Brands from the Keen World marketing site: Colibri Colton Cora CTC Davidoff David Ross Dunhill IMCO K2 Newport Sarome Silver Match Unilight Win Give me more brands that you guys use and I will add em to the list! Here in Canada you buy a 12 pack case of butane cans (300ml) for 65 bucks taxes in. that works out to 5.40 CDN a can.