There’s nothing more frustrating than flat Champagne. But once the cork is out, what’s the best way to keep things effervescent? We put three methods to the test.

1. Put a silver spoon in the neck of the bottle.

2. Decant the champagne.

Though the screw-on cap definitely helps preserve the bubbles, pouring the Champagne from one bottle to another kills 
a lot of the effervescence right at the start.