The exterior-use wood faces raining and sunlight exposure, which can cause property changes of the wood, such as the discolouration, dimensional instability, and biological attack. This article explores the use of citric acid and urea as surface protection of wood. The heating of citric acid and urea can result in the fluorescent carbon dots. These carbon dots can absorb UV light with the emission of the visible light. The carbon dots are the precursor of the insoluble carbonised material, we have also explored its carbonised material for exploring the potential of surface carbonisation.

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