GB wrote:

"Chris Bacon" wrote...
Anneal the stuff as discussed here some time back. Heat the bit of
tube where you want to bend it, and a bit on each side, to redness,
then dunk it in cold water or play water on it to cool. It will
then be soft enough to bend easily.

That's interesting. Never tried this before. What do you mean by redness?
Copper tube is naturally an orange colour, so it's not particularly obvious
(to me).

Until it's red hot. As you heat the tube, it will blacken in your gas
flame - when you play the flame on the tube & you see a coppery patch
in the flame, that's hot enough - you can look at the tube in dim light
'till you get the hang of it.