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[scotty]

Any of you blokes know how you anneal a solid copper head gasket, cant remember if you heat it then let it cool or plunge it edge on into cold water.

[Beezabryan]

Either way is OK however plunge into cold water removes most of the scabbiness

[neddy]

do you remember the colour to heat it ?

[Dennis C]

Cherry red is the advised colour, you decide how ripe they are 😁

[PeteF]

Yes, cherry red which is beyond dull red but don't start getting yellow or you risk melting it.
Best result is if you keep it at cherry red for a few minutes.
As Bryan says, a quench in cold water usually gets rid of all the oxide and doesn't effect the temper.