Ignite Powder is also known as Starting Powder and is required and is must. Sprinkle little Starting Powder on the Mould followed by the Exothermic Weld Powder and again sprinkle it little on the Top Side of Mould. Than Ignite starting powder with a spark gun. This results in exothermic reaction and the Weld Powder melts to molten copper alloy. The molten copper alloy melts the retaining disc and flows into the Welding cavity where it partially melts the conductors.