A good freshly-baked croissant should be flaky and crisp on the outside, and tender and moist inside with all the dough aerated and evenly baked. There should be no layers of unbaked dough, and the crust should leave very little buttery oil on the fingers. Packaged croissants tend to lose their crust but when reheated at 180C/350F/gas 4 for 10-12 minutes regain their crisp exterior.
