Passengers at the capital's airport are having their drinks checked as part of new security measures.
Liquids can only be taken through security if the contents are under 100ml
Edinburgh is one of the first airports in the UK to test drinks, medicines and toiletries for hazardous chemicals.
The scheme is to be rolled out to the rest of the country in the coming weeks.
Security staff are randomly stopping people to carry out "litmus tests" on any liquids they are carrying to ensure they are not banned materials.
Full details of the liquid testing have not yet been revealed for security reasons, but it is part of a wider clampdown on airport security following last year's terror alert.
The move is part of £12m spent by BAA Scotland to speed up the screening process at the country's three main airports.
Passengers are permitted to carry one item of hand baggage, all coats and jackets have to be removed for screening, and passengers can only take liquids through security if the contents are 100ml or less, and are in a transparent plastic bag.
Officials are warning many passengers jetting off on holiday are still getting to grips with new security regulations as it is the first time they have flown since the regulations changed.
An Edinburgh Airport spokeswoman said: "In line with the Department for Transport's guidance to all UK airports on security regulations, we have recently introduced this additional measure.
"We are finding some passengers are flying for the first time since these particular rules came into force so we would remind passengers to make sure they are familiar with the current restrictions."
Edinburgh Airport managing director David Johnston said: "The summer ahead is expected to be another record-breaker for us in terms of passenger numbers, and passengers can do their bit to cut waiting times at security by making sure they are fully aware of the current restrictions before they get to our airport."