For Herbal Extractions you should only use the most PURE Butane available. DO NOT use lighter and BBQ Butane cans which can be Toxic.
Puretane is a clean butane fuel manufactured in the USA to extremely high standards of quality. Puretane is 99.9998% pure N-butane, with only 0.0002% Isobutane. Puretane is shipped in 300ml food-grade plastic lined aluminum cans free from the manufacturing lubricants and propellants.