Three things degrade a product and they act at different speeds: light drives oxidation fastest, heat accelerates every reaction including conversion of acid forms, and air supplies the oxygen. Aroma goes first, colour darkens next, and the cannabinoid profile shifts last. Cool, dark and sealed is the whole answer.
Editorial desk · Written and checked in house · Updated
A certificate describes a batch on a date. What happens between that date and the moment you use it is decided by three variables, and by how the product was stored rather than by who sold it.
| Factor | Effect | Speed |
|---|---|---|
| Light, especially UV | Drives oxidation; breaks compounds down | Fastest — a sunny windowsill works in days |
| Heat | Accelerates every reaction, including acid conversion | Fast above about 30°C |
| Air | Supplies oxygen for oxidation; carries aroma away | Steady once opened |
| Time alone, cool and dark | Slow drift | Months to years |
1. Aroma. Terpenes are volatile and go first, often before anything else is noticeable. A product that smells of less than it did has already changed. See terpenes and why flavour varies. 2. Colour. Oxidation darkens most concentrates — pale gold towards amber, amber towards brown. Darkening alone is not spoilage, but it is a reliable clock. 3. Thickness. Oxidised material is usually thicker, which shows up as a cartridge that draws harder than it did. 4. The cannabinoid profile. Acid forms convert; some compounds oxidise to others. A rising CBN figure is the classic age marker. See CBD, CBG, CBN and the minor cannabinoids.
Usually not worth it and sometimes harmful. Cold thickens contents, which makes a cartridge behave badly, and moving a cold container into a warm room draws condensation inside it. A cool dark cupboard beats a fridge for almost everything here.
This is why a test date is not a formality. A figure measured eighteen months ago describes material that has since been through a summer, a supply chain and a shelf. The number was true; it is no longer a description of what you hold. See why a test date matters as much as the figure.
Terpenes are the volatile aromatic compounds that give plants their smell — limonene in citrus peel, pinene in pine, linalool in lavender. They are why two products with similar cannabinoid figures taste nothing alike, and because they evaporate easily, they are also the first thing heat and time take away.
Solventless means the material was separated using only water, ice, heat, pressure or agitation — no butane, propane, ethanol or carbon dioxide at any stage. It is not a synonym for clean or for strong. It removes one category of risk, and every other question about contamination still applies.
THCa is the acid form the living plant actually produces. Heat drives off a carbon dioxide group and converts it to the non-acid compound, losing about 12 per cent of the molecular weight in the process. That conversion is why a certificate reports both figures and why totals are calculated rather than added.
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