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Other income and other net gains (Details) - HKD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Analysis of income and expense [abstract] |  |
Bank interest income | $ 26,835,314 | $ 31,280,591
Consultancy and management service income | 468,000 | 468,000
Sales and marketing service income | 420,916 | 240,716
Others | 171,944 | 50,037
Total other income | 27,896,174 | 32,039,344
Foreign exchange gain (loss), net | 1,080,594 | (2,489,614)
Gain (loss) on disposal of property, plant and equipment | 31,062 | (160,966)
Gain on lease modification | 0 | 104,493
Waiver from amount due to a related company | 3,591,998 | 0
Total other gains and losses, net | $ 4,703,654 | $ (2,546,087)

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