We present a new experimental technique to characterise the crosstalk of a thermopile-based thermal imager. based on bi-directional electrical heating of thermopile elements. The new technique provides a significantly simpler and more reliable method to determine the crosstalk. compared to a more complex experimental setup with a laser source. https://www.spidertattooz.com/WAC-4011-LED-Horizontal-Step-Light-Colorscaping/