How to make a working Rorschach mask with a wife beater

Homemade Rorschach mask? What?  How come I didn't see this before Halloween?  Well if you've seen the movie Watchmen then you'll know exactly what a Rorschach mask is.  Check this out. 

" Using Thermochromic paint pigment and clear screen printing base, you can now make an ink blot mask that changes like the character Rorschach from the movie the watchmen. As you breath in and out, the color of the mask changes from black to white wherever the wearer’s breath hits it and warms it to a point above 86 degrees F.

If there is a Watchmen 2 I might be able to bust out this Rorschach mask.