coin toneing

[scott]

i thought that, but the wear means it would be that colour right from the off, also dont see why penny area hasn't been treated

[Peckris]

i thought that, but the wear means it would be that colour right from the off, also dont see why penny area hasn't been treated

Yes, good point. It looks a little strange, the lustre, but environmental toning could account for that.

[scott]

thats the thing, its not lustre, its just the metal colour

thoughts on this one?

and here is a 1919 farthing

[Red Riley]

I can't see them all that clearly, but the bun farthing is probably the result of a chemical or even something as mundane as some foodstuff being spilt on it. The 1919 farthing is very typical of it era and if I recall this feature continued until 1921. If brass cartridge cases were used and they contained simply copper and zinc, they could have been added to the furnace without any problems, but why this should make the metal streaky, I know not.

Incidentally, this is a picture of the 1875 1d with streaky toning which I have suggested may be a result of mixing copper ores from two different sources.

[scott]

and anyway, we wern't the only ones with streaky coins

[1949threepence]

Question ~ this "streaking" on coins, as discussed and shown above. Is that the same thing as what they call "marbling" ?

[Peckris]

thats the thing, its not lustre, its just the metal colour

thoughts on this one?

and here is a 1919 farthing

The Edw VII penny doesn't look streaked at all, just some dark staining which could be from anything. The 1919 penny looks in good enough condition for it to be "streaky lustre".

I can't see them all that clearly, but the bun farthing is probably the result of a chemical or even something as mundane as some foodstuff being spilt on it. The 1919 farthing is very typical of it era and if I recall this feature continued until 1921. If brass cartridge cases were used and they contained simply copper and zinc, they could have been added to the furnace without any problems, but why this should make the metal streaky, I know not.

Incidentally, this is a picture of the 1875 1d with streaky toning which I have suggested may be a result of mixing copper ores from two different sources.

Interesting. Those dark patches probably look clearer "in hand"? I can't tell much from the picture.

Question ~ this "streaking" on coins, as discussed and shown above. Is that the same thing as what they call "marbling" ?

"Steaking" may or may not, be lustre. I would have said that "marbling" is the actual metal content, not lustre? IMO.

[scott]

interstingly it seems to pop in in 1953

[Peckris]

interstingly it seems to pop in in 1953

That halfpenny just looks stained scott, i.e. surface, not metal content. Dark patches on bronze are nearly always staining.

And ... this is my 1000th post! Let's see if the label changes or not

Oooh yes, I'm now a Forum God! And in less than a year too! Ok mortals, just build me a temple and offer up a different BU bun penny each week

Edited June 25, 2010 by Peckris

[Red Riley]

And ... this is my 1000th post! Let's see if the label changes or not

Something to do with fish? Oh sorry, I thought it said, 'Forum Cod'.

[Peckris]

And ... this is my 1000th post! Let's see if the label changes or not

Something to do with fish? Oh sorry, I thought it said, 'Forum Cod'.

><((((~º3 ººº

[1949threepence]

Question ~ this "streaking" on coins, as discussed and shown above. Is that the same thing as what they call "marbling" ?

"Steaking" may or may not, be lustre. I would have said that "marbling" is the actual metal content, not lustre? IMO.

OK, thanks Peck. I was a little unsure about whether or not there was a distinction. I always understood marbling to be the exactly parallel lines of slightly different colour, often running diagonally across the face of a coin. Oddly enough, by way of example, both my 1926 pennies have it. The EF OE, and the barely fine, ME. Not really the same as the 1953 coins, but similar to the 1919 penny & 1921 Italian coin, shown below. Maybe slightly more subtle.

As you say, it is possibly the metal content

[scott]

i see the streaking on the cupro-nickel coins as well.

[Peckris]

i see the streaking on the cupro-nickel coins as well.

You mean the reddish streaks commonly seen? That's just got to be a copper-mix fault hasn't it? Quite common on cupro-nickel 1947-1951, but I've seen it as late as mid-60s halfcrowns.

[scott]

yea and on 20p's lol

[Peckris]

yea and on 20p's lol

I'm not surprised. Though you would think the Mint would have eradicated that by now!

[declan03]

I,ve aquired this 1696 Bristol mint William III Sixpence with a small x in REX. Beautiful tone on one side but absolutely none on the reverse.