[NSP] Re: re-conditioning ... (dangers of brass tarnish?)
Brass is not gunmetal. With gunmetal, iron oxide forms a thin airtight layer for a while, protecting the metal underneath, at least till proper rust gets going. With brass, the same is not true for copper and its alloys. So corrosion doesn't prevent further corrosion. Further, the verdigris expands, relative to the metal that was there before, so mechanisms can be jammed. And it looks vile as well. John -- To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
[NSP] Re: re-conditioning ... (dangers of brass tarnish?)
Den 14-01-2011 21:39, [1]gibbonssoi...@aol.com skrev: ..snip With brass, the same is not true for copper and its alloys. So corrosion doesn't prevent further corrosion. Sorry, but I don't quite follow you there. Rust on iron or steel does not prevent further corrosion, but exactly the copper alloys brass and bronze plus pure copper are very well protected by the oxidated layer on the surface. This even works well i a marine environment thus being the reason for all the brasswork that used to be onboard ships. Further, the verdigris expands, relative to the metal that was there before, so mechanisms can be jammed. Yes ! Also the metal oxides accelerates the tendencies of vegetable oils to turn into gum-like snotomers ( he-he, thank's Julia) And it looks vile as well. Depends on the eye of the beholder ;-) But it is also slightly poisonous. Bo A -- References 1. mailto:gibbonssoi...@aol.com To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
[NSP] Re: re-conditioning ... (dangers of brass tarnish?)
I appreciate the anti-corrosion effect of brass regarding seawater but the depth of corrosion required to seal the metal is probably greater than the thickness of most brasswork on a set of pipes. If you ever clean badly corroded brass to get it to look like brass again, you'll find a very pitted surface underneath (I have a large collection of Victorian brass - candlesticks, horse brasses etc) so, by all means leave it green - if you never want it to look smooth and brassy again. Remember that some pipes have ferrules which are not solid metal but are plated - and thin plating at that (maybe NS on brass - the EPNS found on old fruit baskets etc) and, if that corrodes, you are left with patches of brass showing through. By the same token, cleaning them will wear the plating off as well - eventually. Gold fittings won't tarnish (well, people have gold flutes so why not). Colin Hill - Original Message - From: Bo Albrechtsen b...@glaipnir.dk To: nsp@cs.dartmouth.edu Sent: Friday, January 14, 2011 9:45 PM Subject: [NSP] Re: re-conditioning ... (dangers of brass tarnish?) Den 14-01-2011 21:39, [1]gibbonssoi...@aol.com skrev: ..snip With brass, the same is not true for copper and its alloys. So corrosion doesn't prevent further corrosion. Sorry, but I don't quite follow you there. Rust on iron or steel does not prevent further corrosion, but exactly the copper alloys brass and bronze plus pure copper are very well protected by the oxidated layer on the surface. This even works well i a marine environment thus being the reason for all the brasswork that used to be onboard ships. Further, the verdigris expands, relative to the metal that was there before, so mechanisms can be jammed. Yes ! Also the metal oxides accelerates the tendencies of vegetable oils to turn into gum-like snotomers ( he-he, thank's Julia) And it looks vile as well. Depends on the eye of the beholder ;-) But it is also slightly poisonous. Bo A -- References 1. mailto:gibbonssoi...@aol.com To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
[NSP] Re: re-conditioning ... (dangers of brass tarnish?)
On 14 Jan 2011, Colin wrote: Gold fittings won't tarnish (well, people have gold flutes so why not). There are gold-plated sets. The cost, in the current metals market, involves the phrase arm and a leg when compared to silver plate though. Gold plate is also applied much thinner than silver plate (to keep the cost down, presumably). So it might wear through on much used keys for example. It's probably cheaper than a solid silver set right now even so. Julia To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
[NSP] Re: re-conditioning ... (dangers of brass tarnish?)
My SSP set is gold-plated (no keys) and looks as good as new 15 years on now. My NSP (only a few years old) is silver-plated and also looks as good as new. But the gold really stands out, so if you can afford the extra cost, it's really worthwhile! --Rick On Jan 14, 2011, at 5:29 PM, Julia Say wrote: On 14 Jan 2011, Colin wrote: Gold fittings won't tarnish (well, people have gold flutes so why not). There are gold-plated sets. The cost, in the current metals market, involves the phrase arm and a leg when compared to silver plate though. Gold plate is also applied much thinner than silver plate (to keep the cost down, presumably). So it might wear through on much used keys for example. It's probably cheaper than a solid silver set right now even so. Julia To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
[NSP] Re: re-conditioning ... (dangers of brass tarnish?)
And gold is amazingly soft, so won't wear well. John -- To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
