What primary purpose does kiln-drying serve for lumber?

Kiln-drying primarily serves the purpose of reducing the moisture content of lumber. When lumber is freshly cut, it contains a significant amount of moisture, which can lead to various issues such as warping, bending, and mold growth as it dries unevenly. By using a kiln, the moisture is removed in a controlled environment, allowing the wood to dry uniformly and quickly. This reduction in moisture content is crucial for ensuring the stability and durability of the wood when it is used in construction or furniture-making. It prepares the lumber for further processing and helps to prevent problems that arise from excess moisture in the wood, making it suitable for various applications.

The other options relate to qualities that wood may exhibit but are secondary effects or benefits that can stem from the kiln-drying process rather than its primary function. Therefore, the main goal of kiln-drying is truly to reduce the moisture content.