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The identification and differentiation of colours is a relatively problematic task for colour -impaired and partially visionimpaired persons and an impossible one for the completely blind. In various contexts, this leads to a loss of independence or an increased risk of harm. The identification of colour using optoelectronic devices, on the other hand, can be done precisely and inexpensively. Additionally, breakthroughs in miniaturising and integrating colour sensors into biological systems may lead to significant advances in electronic implants for alleviating blindness. Here we present a functional handheld device developed for the identification of colour, intended for use by the vision -impaired. We discuss the features and limitations of the device and describe in detail one target application -the identification of different banknote denominations by the blind.