This feature appears only in the 100-peso banknote commemorating Mexico's Constitution of 1917 and is included in the cotton paper since its manufacture.

It has figures in small square blocks. The thread changes color, from green to gold, and the square blocks are joined together and then separated when the banknote is tilted forward and backward.  

Examination against the light

When placing the banknote against the light, this thread appears unending.