I will fly from Marseille through Amsterdam to Berlin TXL with Airfrance/KLM and I would like to take a large jar of Nutella. It's new and unopened.
Since it's not liquid there should not be a problem taking it, right?
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Nutella is pretty similar to toothpaste in terms of viscosity. Since toothpaste counts as a liquid (source: http://ec.europa.eu/transport/modes/air/security/aviation-security-policy/lags_en.htm), it is reasonably safe to assume that Nutella does so as well.
Also, this page lists "pastes, jams and jellies" as liquids. The latter page is for British Airways flights out of the UK, but it is reasonably safe to assume that the rules are very similar for departures from France.
But you may of course be in luck that the security officer won't see Nutella as a problem. Since — as Relaxed wrote — Nutella is easy to obtain in Berlin, the cost/benefit ratio of bringing it along is pretty low. But I get your point of trying to bring it along. The German Wikipedia page for Nutella states that the version from France is actually slightly different to the German one.
No. Plain and simple. Nutella is basically a gel and honestly I tried once to ask 2 different airports by sending them an email, whether similar things were allowed. They said they are not. Anyway, Nutella doesn't cost a lot and you could try to "sacrifice" a glass of it, but I wouldn't do the same with others gastronomic specialities.
Make sure the Nutella is really cold, so it's solid and not gel-like :-) Of course, transit in Amsterdam will be a pain...
More seriously, I expect the actual decision is based on what it looks like when going through the scanner, which is probably based on the proportion of water in the substance. There have been stories of some types of cakes, as well as cheeses, being rejected. The only way to know for sure is to try (of course, the results may vary from one airport to another, and from one operator to another).
Of course, if you want to keep the jar, nothing prevents you from dropping the succulent brown goo into the bin while keeping the jar. Have a spatula at hand to assist you with this.