Table salt shaker cap with dispenser holes partly plugged with crusted salt and? Domestic staff steeped it in soapy water which has left a greenish/white residue.
The dispenser looks to be plated copper so.. copper oxide?
Not a serious issue but any suitable solvent found in a domestic kitchen?
Try vinegar. It's likely to be a carbonate - probably nickel rather than copper. Nickel carbonate is a lighter green than copper carbonate. Nickel is used as a corrosion-resistant coating for mild steel, but the latter requires an intermediate copper coating as the nickel won't adhere well to the steel.
The problem is that the nickel was probably once covered with a thin layer of varnish, and that has now worn off so it will continue to be attacked. You could try recoating it with a thinned-down varnish. If you use neat varnish, it will probably be thick enough to at least partially block the dispenser holes.
In message snipped-for-privacy@4ax.com, Chris Hogg snipped-for-privacy@privacy.net writes
Duly passed on. Ta
I don't think this would be steel. Came with the marriage so more than
55 years old!A couple of the holes have been enlarged. Probably by me in the distant past.
I'll see how we go with the vinegar. Ta!
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?? I think steel has been around for a much longer time than that.
Indeed. However this the domed top from a small glass screw top container. I don't know how a domed top with a coarse thread in very thin metal would be manufactured but I suspect a more malleable material than steel might be a good choice:-)
The technique is known as 'spinning'
Rotate a disk over a mandrel and apply pressure to force it to the shape of the mandrel
Hmm. No central hole in my cellar top for locating on the mandrel and.. forming the thread?
Does a magnet attract it?
It doesn't need a spindle Yoo form a cup with a pressing, slip that over a bottle and roll the thread into the glass grooves
Part 1
I also wondered about that, but nickel is also ferromagnetic, so you'd never be certain whether it was steel or nickel.
Snip
Excellent. I certainly never thought of using the bottle as a template!
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Pass. None at hand.
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I didn't know that. It seems to have about a third the magnetic strength of iron:
Fridge door seal? A tad weedy admittedly but maybe good enough.
Tim
Ive got lots of loudspeakers littering my desk...
Oh! All right then. It is not the least bit attracted by my granddaughters fridge door Terrapin.
Why can't it just be plated copper?
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But stainless steel wouldnt have been used much for that sort of thing at that time.
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