UV-Vis absorbance and fluorescence of higher BODIPY-C18 concentration in CHCl 3 was measured utilizing custom 50 µm glass cuvette. It was fabricated by placing a 50 µm feeler gauge between two standard 1 mm glass slides, putting cyanoacrylate glue into capillary cavity around the gauge and removal of the gauge after drying. This method does not allow for precise extinction evaluation, since only single-use cuvettes could be fabricated this way, and there exists hardly measurable deviation both in flat capillary thicknesses and an overall cell thicknesses. Though this method was found to suit perfectly for qualitative examination of high concentration solutions to determine the band shapes.