THERMOCHROMIC BAR CODE

摘要

A bar code (10) incorporating thermochromic materials in selected modules (20) such that its code changes with temperature. Below a specified temperature, the bar code (10) displays the code as in Fig 3. Above this temperature, the bar code (10) shows a new code as in Fig. 2. The bar code (10) is printed with conventional printing equipment (not shown) onto conventional printing media, and is scanned with conventional bar code scanning equipment (not shown).