Originally Posted by dyqik
If you want to check the progress of carbonation in bottles, the only reliable way is to bottle some of the beer into plastic soda bottles, and check the pressure by squeezing them. There's no visual indication of carbonation.
I keep a couple of 20oz coke bottles around for this. When I'm done bottling, I pour the small remaining liquid in one of the plastic 20oz and leave it out on the kitchen counter. Every couple days I feel it up real good. When it's hard like a basketball, and doesn't squeak STOP, NO or DON'T, I know it's time to go in the fridge. Takes about a week-ish.
Sometimes the beer in this bottle tastes funky, so it's not always drinkable. You'd have probably tossed the 10-15oz left in the bottom of the bottling bucket anyway, so no real loss.