Buy against measurable specifications
The grade name is only a starting point. A useful specification states the physical chemical and microbiological parameters that matter to the destination and final use. For whole spices this can include size density moisture foreign matter color and infestation. For powders it can also include mesh size volatile oil active compound and microbiological limits.
Use product specific terms. Black pepper may be purchased by density and berry size. Chilli is commonly compared by pungency and color. Turmeric buyers often specify curcumin and moisture. Cumin and coriander offers should state purity and cleaning method.
