Colour-enhanced scanning electron micro-graph of the split end of a human hair showing the outer cuticle layer surrounding the inner cortical layer.

色彩效果增强的人类断裂头发尾部电子显微照显示外面的表皮层包裹着里面的皮质层。

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To fill the USB slot with colour go through Layer>Rasterize>Layer and then pick the Paint Bucket Tool and use the color #333333 .

执行 图层 > 栅格化 > 图层 ，然后选择 油漆桶工具 ，使用 #333333 颜色填充USB接口。

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In this case, they are used to make "multi-junction" solar cells, in which each layer captures energy from a particular colour in the spectrum of sunlight.

在这个例子中，纳米材料被用来制造“多结”太阳能电池，每一层都对应捕捉光谱中的一种颜色的能量。

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Get through that covering layer and the underlying slivery colour of the aluminium itself will show through the black layer.

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The real reason, I suspect, that this has been done on the iPhone is that it is this anodised layer that you can then dye to pretty much any colour you want.

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If you want black, or white, or any other colour, then you need to anodise so that you can dye that layer.

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