Visually you can see the colors clearly. You should have
little trouble heating up the entire beaker with it. The
torches are not that expensive and if you do much of this
larger silver work it would be worth your while to set one up.
Thanks for your comments. However, the problem was not at all
the type of annealing torch, but the main problem was how to
judge when you have reached the 300 degr. C. At this temperature
you will not see any colour at all from the metal, be it in
sunshine or in a completely dark room.
I have been doing some experiments on the subject. Somebody
mentioned writing on the metal with a ink marker and turned out
to function very well.
I went through the various chemicals in my shop to try to find a
medium with a melting point near the 300 degr. C. and found that
sodium hydroxide melts at 318 degr. C.
I then tried to put a little pellet of sodium hydroxide (NaOH)
in the beaker and stop the annealing when the pellet melted.
That functioned very well. The only thing is you have to be a
little carefull about the water you use for quenching as it
might have bedome a little etching.
I would like to thank everybody who contributed to solving this
little question, and in the end, I think I will stick to the ink
Niels L=F8vschal, Jyllinge, Denmark
phone (+45) 46 78 89 94