This proof is to take advantage of some sencitivity in lighting, adhesive or phacolytic in the photographic film separations on the color of the dot image.

• 这栽打样办法是诳骗某些感平质料在平照前提下，爆发粘着性或溶解性改变，在片基上留住响应分色片颜色的网点图像。