<![CDATA[The use of hydroquinone in skin-whitening creams is highly dangerous, as hydroquinone is a potentially carcinogenic compound that can cause cancer. This study aims to design a device capable of detecting the concentration of hydroquinone in skin-whitening creams. The focus of the research is on an optical system that measures the intensity of light produced by a UV LED source when transmitted through skin-whitening cream samples that have been mixed with FeCl₃ reagent solution. The transmitted light intensity is measured using a GUVA-S12SD sensor, then converted into an electrical signal and processed by an Arduino Uno microcontroller. The measurement results are displayed on an LCD screen, and the system is equipped with a buzzer as a detection indicator. System testing was carried out by comparing the results with those obtained from a UV-Vis spectrophotometer. Based on the test results, the device was able to detect the presence of hydroquinone with an accuracy of 94.67% and demonstrated good sensitivity to variations in concentration. Tests were also conducted on 10 skin-whitening cream samples, in which 4 samples were found to contain hydroquinone. These results indicate that the designed device can operate effectively and can be used as an alternative tool for detecting hydroquinone content in skin-whitening cream products]]>
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