TruTags, each barely visible to the naked eye, appear iridescent when they catch the light. Pictured are hundreds of TruTags in an area about the size of the head of a pin.
Click for 1280 x 960 pixel image, 456K

Cellular Bioengineering staff work in lab.
Click for 780 x 500 pixel image, 260K

A gram or so of TruTags on a screen mesh. Each TruTag contains a customer-specific code for tracking the authenticity of the product.
Click for 640 x 480 pixel image, 189K

Spectral signatures can be individually tailored. Two examples here illustrate fine control of spectral peak amplitude.
Click for 800 x 532 pixel image, 116K