Decarboxylation is the reaction that turns THCA into THC. It sounds like laboratory language, and it is, but the mechanism fits in a sentence: heat breaks a small acid group off the THCA molecule, carbon dioxide leaves, and THC remains. Everything else is temperature and time.
What actually happens
THCA carries a carboxylic acid group that THC does not. The bond holding that group is stable at room temperature but breaks down under heat. When it goes, the molecule sheds carbon dioxide and loses about 12% of its mass, which is why chemists convert THCA to THC potential by multiplying by 0.877 rather than counting it whole. The result is Δ9 THC, the intoxicating cannabinoid, and the difference between the two states is covered fully in the comparison file.
The temperatures that matter
Decarboxylation is not a switch, it is a curve. At room temperature the reaction crawls along over months, which is one reason old, badly stored flower drifts away from its certificate. In an oven, conversion moves seriously at around 220 to 245°F and completes in roughly 30 to 45 minutes at the low end of that range. A vaporizer running at 350 to 400°F converts on the draw. A flame converts instantly: combustion runs far past every threshold in this paragraph.
Practical summary: smoking and vaporizing decarboxylate THCA in real time. Eating raw THCA flower does not convert it, which is why the compound behaves so differently in a kitchen than in a jar. Heat first, always, if conversion is the goal.
Why this matters for storage
The same chemistry that unlocks the flower will also degrade it. Heat, light, and oxygen keep pushing the reaction forward, and past THC the chain continues to CBN, a cannabinoid associated with a flat, sleepy character rather than the profile you paid for. So the storage rule is the reaction in reverse: cool, dark, airtight. Treat the jar as an archive. The house ships every flower release sealed at peak for exactly this reason, and our buying standard treats cure and packaging as seriously as potency.
Why the certificate reads the way it does
A laboratory tests flower in its raw state, so the certificate shows high THCA and minimal Δ9 THC. That is not a trick of paperwork, it is an accurate photograph of the product before heat. The number your evening cares about is the total potential: THCA times 0.877 plus Δ9. Every certificate in the certification library gives you what you need to run it. Ten seconds of arithmetic, complete clarity, no fog.