Can weights of less than 100 grains be made of aluminum?

The correct response indicates that weights of less than 100 grains can indeed be made of aluminum. This is because aluminum is a lightweight, durable material that is often utilized in various applications, including those requiring precise weight measurements. In certain contexts, especially in laboratory settings or specialized industries, weights made from aluminum can perform adequately and meet necessary accuracy standards for tasks involving lower weight measurements.

Additionally, aluminum's resistance to corrosion and its favorable characteristics for manufacturing make it a suitable choice for small weights. It is common in scenarios where the weight must be easily handled and resistant to wear over time. Thus, the use of aluminum for weights under 100 grains aligns with both practical applications and material properties, supporting the assertion made in the correct answer.

Understanding that regulations may apply in certain contexts, weights intended for specific legal or trade-related uses might be required to adhere to different standards or materials, which could explain why other options mention conditional factors. However, regarding general applications, crafting small weights from aluminum is not inherently prohibited and can be deemed acceptable.