涂在可能被盗物品上的粘着剂本身起着警示的作用，但真正的窍门是接下来发生的。
That, by itself, ACTS as a warning that goods might be stolen, but the real trick is what happens next.
除了小微粒，每批粘着剂都包含着特异的多达30种稀土的金属复合物。
Besides the microdots, each batch also contains a unique combination of up to 30 compounds of rare-earth metals.
虽然粘着剂在普通光照下看不见，但一旦变硬便可以在紫外线光束的照射下变成黄色。
Though invisible in normal light once it has hardened, this adhesive glows yellow when illuminated by a beam of ultraviolet of the sort often used in discotheques.
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