What is noted about the new lead-free solder in terms of its working properties?

The correct answer highlights that lead-free solder typically melts at a low initial temperature compared to traditional solders that contain lead. This characteristic is particularly important in soldering applications because it allows for the joining of components without damaging sensitive electronic parts or substrates.

Lead-free solders are formulated to ensure they can perform effectively while complying with environmental regulations, which often mandate the elimination of lead due to its toxicity. As a result, these solders are designed to maintain effective bonding abilities at lower temperatures, making them suitable for a wide range of applications in electronics where thermal stress must be minimized.

In contrast, other options present different qualities. For instance, while it's true that some lead-free solders can have a higher melting point than certain leaded solders, the statement about high melting points does not capture what is commonly understood about their usability in practical scenarios. A wide melting range can also apply to different solder types, but emphasizing the lower initial melting temperature offers a clearer understanding of what makes lead-free solder advantageous in various applications. Lastly, while some lead-free solders may require adjustments in technique or tools, they do not universally necessitate special equipment, making that assertion less accurate in a general context.