I’m currently working on a project where I want to follow a shiny black line on a mat black surface. The surface is glass. I have had previous experience with the QTR-8RC sensors when it comes to following a black line on a white surface. When I tried to use the sensor for my current project it does not see the difference between the shades of black (visually there is a big difference).It sends back full absorption values for both shades. Is there a way to calibrate the sensor so that it is more sensitive in the high absorption range? Or is this sensor not right for this application. I am desperate for any information regarding this topic, since I cant find information on it online, So any feedback is appreciated.