Lichroma was attached to a Nikon LV100 brightfield optical microscope in reflection mode. We tried to image an unknown sample (an unidentified black rock with shiny particles embedded inside. We used an oil immersion 100X objective lens with a numerical aperture of 1.25 to perform the imaging, as we wanted to catch as much as possible information from the sample. We switched on the white light illumination (cold white) and we could not get a clear image due to the excessive reflection from the sample (the first image from the left-hand side). Going to a warmer light (in the right-hand side image) diminished the reflection (the noise) and increased the contrast of the sample; it was possible to distinguish individual particles less than a micrometer in diameter. This made us curious to investigate the sample more. We navigated through the colours spectrum to find out that a mint green green illumination (left-hand side, second row) gave us an amazing resolution as we were able to see clear individual particles with no background noise. We could also play with the Z stage of the microscope and see different particles at different focal points. We did not want to stop here, and we chose a lower wavelength (azure blue illumination). We were not surprised to see that we've got the same amazing resolution (because we went to even a lower wavelength, and more over, now we can see that some particles are greenish, which, we assume it might be an emitted fluorescent signal. It might be a signal from a metal oxide, as the sample was left for a long time under ambient conditions. But the most important, we can identify things that we are interested in due to the zero background noise! If you have any thoughts about the sample, or if you would like to investigate a similar sample by yourself using Lichroma, please contact us at enquiry@mountedleds.com