I've made a very simple colorimeter. An RGB LED illuminates transparent liquid samples with red, then green, then blue light. A detector detects the intensity of light that comes through the liquid.
I put blue food coloring into water and tested it. I was surprised that it seemed that blue light was NOT transmitted but the other two colors were, with red transmitting the most.
I'm fairly sure I'm interpreting my results correctly, but they are very much contrary to my expectation. Do my results make sense? If so, why?