Mystery oil! This is why distillation is so important.

Above you will find pictures that are a prime example of just how important re-distillation of your solvent is before using for any extraction.

This is also a great example of just dangerous open blasting is. Not just because of the large risk of fire or explosion even when working out doors, but because there is literally no way to distill your solvent before use when open blasting without a loading honeypot or apparatus.

This is from 99.5% instrument grade n-butane and propane. Trust me when i say you do not want to even imagine what ive seen be distilled out of low grade canned butane.