Solvent-based extraction and the concentrates it produces: ethanol, hydrocarbon and supercritical carbon dioxide, winterisation and distillation, and the safety and licensing questions that arrive with all of them. Solventless methods have their own sub-board.
Each solvent trades off differently. Ethanol is forgiving and pulls chlorophyll and waxes along with the target, hydrocarbon is selective and flammable enough that improvised equipment is genuinely dangerous, and carbon dioxide is tunable, expensive and slow. What they share is that the crude output is the start of the work rather than the end of it.
Two limits govern every thread here. Extraction concentrates contaminants along with cannabinoids, so a pesticide residue that passed on flower can fail as an extract, which makes input testing part of the process. And in Thailand extracts above 0.2 percent tetrahydrocannabinol fall under the Ministerial Regulation on Cannabis or Hemp Extracts B.E. 2569, in force since 26 April 2026, which restricts licensing to Thai legal entities, government agencies and the Thai Red Cross Society: this is not a home project here.
Where to start