When evaluating peanut paste, the primary quality indicators are particle size (fineness), oil separation rate, and aflatoxin levels. For industrial applications like confectionery, a fineness of sub-200 mesh is often required for a smooth mouthfeel. Ensure the product is made from high-oleic peanuts if a longer shelf life is needed, as these are more resistant to rancidity. Additionally, verify the roasting degree (light, medium, or dark) as it significantly impacts the flavor profile of the end product.