但是，当粒子聚集在一起时，金粒子就由红色变为蓝色，银粒子由黄色变为紫罗兰。

As the particles clump together, though, gold's red turns to blue and silver's yellow turns to violet.

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例如，五纳米的金粒子呈现红色，银粒子呈黄色。

Five-nanometre gold particles, for example, look red, and silver ones look yellow.

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光中的颜色仍然未被吸收，例如5毫微米的金粒子呈红色，而银离子呈黄色。

The colour comes from the light that remains unabsorbed. Five-nanometre gold particles, for example, look red, and silver ones look yellow.

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