《天工开物·中篇·杀青》
烘焙纸张时，先用土砖砌两堵墙形成夹巷，底下用砖盖火道，夹巷之内盖的砖块每隔几块砖就留出一个空位。
凡焙纸先以土砖砌成夹巷地面，下以砖盖地面，数块以往，即空一砖。
When baking paper, first build two walls with earth bricks to form a narrow alley, with a fire passage made of bricks at the bottom, and leave a gap every few bricks in the bricks covered in the narrow alley.