Interesting Tiffen DFX Filter Trick

I've been a fan of the Tiffen DFX Filters ever since version 1 and version 3 is definitely the best yet.

When using them to process some broken glass shots of Detroit (what else!), I ran across this interesting effect if you apply the x-ray filter twice

Original

One application of the x-ray filter

Double application of the x-ray filter

The double filter almost looks like something you could actually see under natural lighting conditions.