When sourcing White Petroleum Jelly, the primary focus must be on purity levels and compliance with pharmacopeia standards. Ensure the product meets USP (US Pharmacopeia), BP (British Pharmacopeia), or EP (European Pharmacopeia) standards. Key technical indicators include a melting point between 38°C and 60°C, high viscosity stability, and a color rating of 0Y (pure white). For medical or cosmetic grades, the product must be odorless and tasteless, with a Polycyclic Aromatic Hydrocarbons (PAHs) test report to ensure it is non-carcinogenic and safe for skin contact.