卡罗摄影法对化学处理纸的使用是革命性的，其中光照区域色调变暗，形成负像。
The calotype was revolutionary in its use of chemically treated paper in which areas hit by light became dark in tone, producing a negative image.
色彩搭配可以选择明亮的色系，但一定要记住孩子们可总是精力充沛，所以睡觉的区域最好选择相对平和的色调。
Color schemes can be bright but keep in mind that they are very energetic so you might want to keep your kids' sleeping area more calm.
这些折射的光线大多数处于光谱的红光区域，因此，从地球上看来，月球变成了红色、黄铜色或者橙色色调，有时甚至会变成褐色。
Most of this refracted light is in the red part of the spectrum and as a result the moon, seen from Earth, turns a reddish, coppery or orange hue, sometimes even brownish.
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