Nonetheless, UV-visible spectroscopy techniques rely on expensive optical systems, including light sources, spectrometers, optical cuvettes/cells, optical fibers, etc. Typically, the absorbance spectra obtained with these systems are "continuous", containing at least 3000 data points and spanning a broad wavelength range (300 to 1000 nm). In this study, we propose to drastically lower the number of channels, effectively using a discrete spectrum of only 6 channels. This spectrum can be acquired using a low-cost spectrometer typically sold for less than € 30 (e.g., the Electrolyte mixture