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Intangible assets (Details) - HKD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of detailed information about intangible assets [line items] |  |
Beginning balance | $ 825,000 |
Ending balance | 780,000 | $ 825,000
Patent license |  |
Disclosure of detailed information about intangible assets [line items] |  |
Beginning balance | 825,000 |
Ending balance | $ 780,000 | 825,000
Estimated useful lives | 20 years |
Cost | Patent license |  |
Disclosure of detailed information about intangible assets [line items] |  |
Beginning balance | $ 900,000 | 900,000
Ending balance | 900,000 | 900,000
Amortization | Patent license |  |
Disclosure of detailed information about intangible assets [line items] |  |
Beginning balance | (75,000) | (30,000)
Charge for the year | 45,000 | 45,000
Ending balance | $ (120,000) | $ (75,000)

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