Thank for the answer. - Will your target species be heated to melting before that heat transfers to other stuff? = That's the plan, the heat will propagate so

Thank for the answer. - Will your target species be heated to melting before that heat transfers to other stuff? = That's the plan, the heat will propagate so I want to apply just enough heat to minimize the amount of heat transferred. They have different melting points: around 50C in difference.