In article .com,
Lobster wrote:
Isn't the blue part of the flame unburnt gas though?

No - it's simply not the hottest part. But still plenty hot for the job in
hand and not so localised as the very hot part which has a name I've
forgotten. ;-)

I don't follow that one, as my problem seems to me that for whatever
reason I'm not getting up to temperature quick enough!

The speed doesn't much matter.

--
*Beauty is in the eye of the beer holder *

Dave Plowman London SW
To e-mail, change noise into sound.