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Current state of coffee purity research
The field is simple when you stop letting brands hypnotize you: verify contaminants, verify sourcing, verify freshness, then decide whether the cup and price are good enough.
Contaminants
Heavy metals, mycotoxins, pesticide residues, and microbial quality are the core purity questions. Panic is useless; test results are useful.
Transparency
A real claim names the lab, batch, date, analytes, limits, and numeric results. Anything less is marketing fog.
Cup quality
Clean coffee still has to taste good. Roast date, whole bean storage, grind quality, and brew method all affect whether the purchase is worth repeating.