Le 2011/09/06 15:59, Darren New a écrit :
> On 9/6/2011 11:34, Jim Henderson wrote:
>> I've also had it happen to me.
>
> Me too.
>

Put a pinch of croase sand in the container. It provide some angular 
surfaces that will stimulate the bubble formation as the liquid reatch 
the ebulition point. It will allow a gradual transition.
You can also rub the inside bottom of a container with fine sand paper.

About any rough surfaced material will do the trick.

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