Dr.RenalNash said:The pattern that distinguishes a bad batch from an exit is behaviour rather than product.
Agreeing with Dr.RenalNash, and the qualification matters more than the agreement. The useful checklist is about verifiability rather than presentation. Independent test results commissioned by buyers rather than by the seller, consistency across multiple batches over time rather than one flattering report, a physical address and a company registration that resolve, batch and lot numbers on the actual labelling, and a shipping practice that matches what the material needs. Everything a good-looking website provides is cheap to fake; none of the items above are.
Correct me if the detail matters more than I have assumed.