Does anyone know if this product can be used to track a yellow line on a purple floor? Thanks
I believe it should, maybe not very well. Keep in mind purple would absorb more light and yellow will reflect the light more.
What really matters is the IR reflectance of the purple and yellow, but I expect there to be some difference, as travis pointed out. If you want an inexpensive way to test it, you could start by getting a QTR-1A sensor and see if you get different readings from the yellow and purple surfaces.