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On the back of the banknotes there are designs printed with fluorescent ink, which glow when placed against ultraviolet light (also known as “black light”). In particular, the flourescense feature in the current 50-peso (Type F1) and in the 100-peso banknote commemorating the 1917 Constitution is composed of two colors.

Fluorescencia en rev billetes F y F1 -inglés

Cotton paper banknotes they have color fibers on both sides—that is, tiny fibers embedded in the paper and distributed randomly. These fibers are fluorescent and can only be seen under black light.

When placing the obverse side of 100-peso, 200-peso, 500-peso and 1000-peso banknotes under UV-A light, the 3D-thread shines.

Anv bill F bajo luz negra, sin conmemorativos

In the 100-peso banknotes commemorating de 1917 Constitution there are some figures that shine on the zipper-effect thread.

100conmConst fluorescencia anv    100conmConst fluorescencia en hilo