Subzero 1 Lb. Orders over $100.00 are usually shipped within 24 hrs of receipt (excluding weekends). The estimated delivery dates showing on Amazon are usually delivered much sooner than the dates shown. Powdered nitric acid substitute. Non-hazmat! Safe to ship via UPS with no hazmat fee and no danger. This material is pH neutral and is only a substitute for nitric when added to hydrochloric or muriatic acid. Refer to instructions on how to refine with subzero.Replacement supplies for Simplicity Gold and Platinum Refining System. (Part Number 63500). Free Shipping!!! Used by Professional Jewelers