High-quality Moringa powder should exhibit a vibrant bright green color; a dull or brownish hue often indicates oxidation or poor drying techniques. The texture must be fine and uniform (typically 80-100 mesh) without visible stems or sand. From a chemical perspective, buyers should request a Certificate of Analysis (COA) to verify the absence of heavy metals (Lead, Arsenic, Mercury) and microbial contaminants like E. coli or Salmonella. Purity testing is essential to ensure no fillers, such as starch or grass powder, have been added.