1895年，威廉·伦琴偶然发现阴极射线管能使涂有一层氰亚铂酸盐钡的薄相纸发光，甚至当阴极射线管和相纸分别放在不同的房间时也能发光。

In 1895, Wilhelm Roentgen accidentally discovered that a cathode-ray tube could make a sheet of paper coated with barium platinocyanide glow, even when the tube and the paper were in separate rooms.

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经过硒调色图片的颜色和色调变化在不同的相纸上有不同的表现：从冷调褐色、到紫褐色，有着很细微、可辨别差别。

The colour and degree of tonal changes achieved will vary according to the type of paper: ranging from cool chocolate-brown, through purplish brown, to little discernable change.

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这种相纸含有分层涂布的、反差不同的一层感蓝卤化银涂层和一层感蓝绿的涂层。

The paper has a blue sensitive silver halide layer and a blue-green sensitive layer coated separately, and having different contrasts.

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