Yes Butane is Organic. We prefer butane over other solvents because of its low boiling point and its ability to rapidly break down plant resin. This allows us to strip the plant of resin without extracting undersireables like chlorophyll and lipids.
Butane has a boiling point of zero degrees Celsius and is easy to evaporate out of the finished product. In Colorado the legal limit allowed to remain in concentrates is 800ppm. OSHA states that the recommended airborne exposure limit is 800 ppm averaged over a 10-hour workshift.
We don't suggest that you inhale strictly bho vapor for 10hrs straight but according to OSHA you won't exceed your butane limit. 🙌🙌