查看完整版本 : 有冇人屋企啲銀幣有牛奶班

有冇人屋企啲銀幣有牛奶班，
一買返嚟已經即刻放入電子防潮箱，點解重係咁？:smile_27:
[attach]13708828[/attach]

[quote]原帖由 [i]big@john[/i] 於 2022-10-30 13:09 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553317395&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
有冇人屋企啲銀幣有牛奶班，
一買返嚟已經即刻放入電子防潮箱，點解重係咁？:smile_27:
[img]https://img.discuss.com.hk/d/attachments/day_221030/20221030_1248dc8460454194743e735evX8Sa0Pq.jpg[/img] [/quote]
潮濕唔係主因

咁有乜方法可避免或清除？

[[i] 本帖最後由 big@john 於 2022-10-30 13:19 編輯 [/i]]

[quote]原帖由 [i]big@john[/i] 於 2022-10-30 13:17 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553317686&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
咁有乜方法可避免或清除？ [/quote]
我就覺得唔好晒心機搞。好難整得走。

全新買返嚟好好保存，無端端變成咁，睇見咁已經冇興趣再玩白銀

[quote]原帖由 [i]big@john[/i] 於 2022-10-30 14:16 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553319549&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
全新買返嚟好好保存，無端端變成咁，睇見咁已經冇興趣再玩白銀 [/quote]
以前冇咁差的。係2010年之後很多鑄幣廠都出現呢類普銀出白點奶漬問題。

想問吓，咁啲金銀鋪，好似帝豐、LPM嗰啲，點樣存貨呢？佢入咗貨，存放耐咗有牛奶班咁點賣出？

[quote]原帖由 [i]big@john[/i] 於 2022-10-30 13:09 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553317395&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
有冇人屋企啲銀幣有牛奶班，
一買返嚟已經即刻放入電子防潮箱，點解重係咁？:smile_27:
[img]https://img.discuss.com.hk/d/attachments/day_221030/20221030_1248dc8460454194743e735evX8Sa0Pq.jpg[/img] [/quote]
Royal Mint嘅銀幣特別易出牛奶斑, 我D女王神獸BU好多都有。

RCM楓葉幣有防白斑處理當然完好啦, 睇返放埋一齊嘅其他銀幣例如鷹揚、熊貓、袋鼠同愛樂團都好地地, 所以我可以肯定係Royal Mint嘅問題。

[url]https://youtu.be/PD44HLotyq8[/url]

[[i] 本帖最後由 CP-KELVIN 於 2022-10-30 16:51 編輯 [/i]]

Milk Spots on Silver Coins


[img]https://www.chards.co.uk/media/uploads/Team%20Page/120px/lawrence120.jpg[/img]
Author: [url=https://www.chards.co.uk/author/lawrence-chard]Lawrence Chard - Director and Expert Numismatist[/url]
Published: 19 Aug 2021
Last Updated: 20 Aug 2021



Contents: Mint Responses   


Synopsis

I had never heard the term "milk spot" until the last year or two.

I think I first became aware of it on The Silver Forum, where there seems to be lots of discussions and complaints about milk spots, mainly about British Royal Mint silver coins including some high premium proof coins, and also bullion coins like Britannias.

[img]https://www.chards.co.uk/media/blog/1019/milk-spots-on-silver-coins-3799.png[/img]
Milk Spots

Milk Spots

This composite image shows milk spotting on a 2021 UK silver proof Queens's Beasts Black Bull of Clarence coin, one of 9 coins from a 10-coin Royal Mint set to feature this production defect.


[img]https://www.chards.co.uk/media/blog/1019/milk-spots---2021-black-bull-of-clarence.jpg[/img]
Of course, I have seen white spots on silver coins before, but had never called them milk spots, or heard anyone else call them that, until quite recently as I just mentioned.

I can call to mind seeing a slight grey blue bloom on some silver proof crowns from 1980 and 1981. In the past, we have tried silver dipping a few coins, but with very poor results. I suspect that this bloom is caused by the same or a similar production problem.

A quick search using Google will find many pages discussing the problem, but none which states its cause, although a few of the sites including YouTube videos seem to claim to explain the phenomenon and its cause, but fail to actually do so.

A number of these sites mention that it might be caused by solvents or detergents used to clean the planchets (blanks). Some suggest PVC. Although PVC can and does cause some tarnishing, corrosion, or discoloration, I have never noticed it causing milk spots, so I think we can discount the PVC theory. My own thoughts were that it might be caused by oils or other lubricants, affecting either the blanks or the actual coins during the striking process.

The Royal Canadian Mint is to be commended because, according to its website, it carried out research over about 4 years, and in 2018 introduced something called MintShield, which reduces, slows down, or helps to prevent milk spotting. It proudly states that it now incorporates MintShield into its silver bullion maples, and other silver coins. However...

... Disappointingly, the RCM fails to state clearly what causes the problem, what MintShield is or how exactly it works, stating it is a secret process. While I can understand it protecting its investment in research to develop the process, I feel I should deduct points for choosing to withhold the basic facts, namely what is milk spotting, and what causes it.

Mint Responses

As recently as yesterday, I asked our main Perth Mint contact what Perth Mint knew, as I cannot remember seeing it on their silver coins, although I feel sure somebody will have done.
I received the following very prompt reply:
[indent][i]Such spots are caused regularly by some small pollutions at the production process. TPM has made large efforts by cleaning the factory to prevent such spots.[/i][/indent][indent][i]I will check if there is any further “official” statement available about that theme from TPM.[/i][/indent]Obviously, this does not explain everything we all want to know, but at least it is more than I have heard from any other mint, apart from the RCM as mentioned above. If I receive any further information, I will post it here.

[quote]原帖由 [i]CP-KELVIN[/i] 於 2022-10-30 16:55 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553324334&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
Milk Spots on Silver Coins


[img]https://www.chards.co.uk/media/uploads/Team%20Page/120px/lawrence120.jpg[/img]
Author: Lawrence Chard - Director and Expert Numismatist
Published: 19 Aug 2021
L ... [/quote]
Thanks for the information

[quote]原帖由 [i]big@john[/i] 於 2022-10-30 16:20 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553323405&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
想問吓，咁啲金銀鋪，好似帝豐、LPM嗰啲，點樣存貨呢？佢入咗貨，存放耐咗有牛奶班咁點賣出？ [/quote]
Lpm係有賣過 表明係spotted嘅銀幣

[quote]原帖由 [i]CP-KELVIN[/i] 於 2022-10-30 16:49 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553324199&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]

Royal Mint嘅銀幣特別易出牛奶斑, 我D女王神獸BU好多都有。

RCM楓葉幣有防白斑處理當然完好啦, 睇返放埋一齊嘅其他銀幣例如鷹揚、熊貓、袋鼠同愛樂團都好地地, 所以我可以肯定係Royal Mint嘅問題。

https://youtu.be/PD44HLotyq8 [/quote]
其實某年嘅 Perth mint鑄造嘅普銀(包括 kook, lunar, koala) 都出白點奶漬，自此之後我近乎放棄再收藏普銀。

近排入盒精鑄都出事:funk:

[quote]原帖由 [i]yiyiallall[/i] 於 2022-10-31 09:48 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553342457&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
近排入盒精鑄都出事:funk: [/quote]
睇完你d相同以下資料，我都想放棄買銀，只買金同已經氧化處理的仿古銀幣算啦...:smile_13:

[url=https://coinhunter.co.uk/50p/silver-proof/coin-toning/]https://coinhunter.co.uk/50p/silver-proof/coin-toning/[/url]

[quote]原帖由 [i]EyeonHK[/i] 於 2022-10-31 10:44 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553344111&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]

睇完你d相同以下資料，我都想放棄買銀，只買金同已經氧化處理的仿古銀幣算啦...:smile_13:

https://coinhunter.co.uk/50p/silver-proof/coin-toning/ [/quote]
Royal Mint是很差勁的. 本身生產過程很有可能已經有問題. 又冇QC. 客服態度做又三十六, 唔做又三十六. 聽西人講, RM係會將客SEND番去有瑕疵的次貨賣比其他人. 都幾痴線.

我有PERTH MINT 1公斤普鑄銀LUNAR. TOUCH WOOD冇出白點. 我都冇攪防潮.

[quote]原帖由 [i]yiyiallall[/i] 於 2022-10-31 11:11 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553344779&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]

Royal Mint是很差勁的. 本身生產過程很有可能已經有問題. 又冇QC. 客服態度做又三十六, 唔做又三十六. 聽西人講, RM係會將客SEND番去有瑕疵的次貨賣比其他人. 都幾痴線. [/quote]
唉, 我手上都好多精鑄銀幣係Royal Mint出品。:smile_13:

我見到CHING都有儲British Monarch, 你有冇打算儲齊成個系列? 我買左第一同第二個, 而家已經出到第四個, 我十五十六繼唔繼續好, 因為佢成套有21個咁多, 當中好難避免出事...:smile_39:

作為新手的我(剛好入坑1年)，RM真係聽唔少PK行為。

銀幣起白斑,
如果唔係拋光位試下用最軟身嗰隻擦子膠,
平價幣開始,慢慢試驗!,,,

[quote]原帖由 [i]CP-KELVIN[/i] 於 2022-11-2 03:09 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553387101&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]

唉, 我手上都好多精鑄銀幣係Royal Mint出品。:smile_13:

我見到CHING都有儲British Monarch, 你有冇打算儲齊成個系列? 我買左第一同第二個, 而家已經出到第四個, 我十五十六繼唔繼續好, 因為佢成套有21個咁多, 當中好難避免出事...:smile_39: [/quote]
d圖我在網上討論區找的。英國本地人嬲到要去 ombudsman投訴，唔知真定假。我自己有嘅 RM白銀產品就只有QB同 TB 精鑄銀幣，有入了盒的，也有裸幣。British Monarch我就冇買。

[quote]原帖由 [i]yiyiallall[/i] 於 2022-11-8 17:32 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553553443&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]

d圖我在網上討論區找的。英國本地人嬲到要去 ombudsman投訴，唔知真定假。我自己有嘅 RM白銀產品就只有QB同 TB 精鑄銀幣，有入了盒的，也有裸幣。British Monarch我就冇買。 [/quote]
咁都冇咁驚, 我仲以為單係你一個就已經有咁多銀幣出左事, 咁出事機會就好高喇, 而家我都定D...:smile_42:

[quote]原帖由 [i]CP-KELVIN[/i] 於 2022-11-8 23:55 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=553560598&ptid=30837368][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]

咁都冇咁驚, 我仲以為單係你一個就已經有咁多銀幣出左事, 咁出事機會就好高喇, 而家我都定D...:smile_42: [/quote]
可以過多幾個月拎番出黎睇下有冇出事。😆