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Copper ion contamination in water poses serious risks to human health, ecosystems, and has been linked to neurodegenerative disorders. This preliminary study focuses on colorimetric sensor development based on bis-indolylmethane (BIM) derivatives, synthesised via reaction of indole and aldehydes using acetic acid. The compounds were characterised using a few spectroscopy methods. The BIM compound solution showed a strong colour change upon copper (II) ion exposure, supported by UV-Vis titration and binding constant analysis. This simple heavy metal sensor offers potential for environmental monitoring, water treatment, and public health protection with practical applications for industries and communities in ensuring water quality.