You can take them provided they’re packed in a sealed tamper-evident bag, with a receipt inside the bag. Also, it’s better if they’re bought just prior to flight.
During security check they must be presented for separate inspection. Liquids might be removed from the bag, scanned, and repacked in a new bag, which can take up to 5-10 minutes depending on the airport.
Sources: experience, EU Regulation 185/2010
Other revelant links:
EU airport security rules page at europa.eu
Credit:stackoverflow.com‘
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