有冇人屋企啲銀幣有牛奶班

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big@john 尊貴會員帖子 2077 積分 1878 註冊 2013-10-18 發短消息加為好友	[其他] 有冇人屋企啲銀幣有牛奶班 #1 發表於 2022-10-30 13:09 只看該作者大中小繁簡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？ mobile_1.jpg (266.49 KB) 2022-10-30 13:09
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yiyiallall 油雞滷味樣樣都要 Silver Member 帖子 14695 積分 14096 註冊 2008-8-19 發短消息加為好友	#2 發表於 2022-10-30 13:16 只看該作者大中小繁簡引用: 原帖由 big@john 於 2022-10-30 13:09 發表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？潮濕唔係主因
UID 3335487 帖子 14695 精華 0 積分 14096 金幣 1646 閱讀權限 70 來自 [img]http://cdn01.cdn.socialit 在線時間 6242 小時註冊 2008-8-19 最後登錄 2023-6-5 查看詳細資料	回覆引用 TOP

big@john 尊貴會員帖子 2077 積分 1878 註冊 2013-10-18 發短消息加為好友	#3 樓主發表於 2022-10-30 13:17 只看該作者大中小繁簡咁有乜方法可避免或清除？ [ 本帖最後由 big@john 於 2022-10-30 13:19 編輯 ]
UID 5286405 帖子 2077 精華 0 積分 1878 金幣 1329 閱讀權限 50 在線時間 5245 小時註冊 2013-10-18 最後登錄 2023-6-2 查看詳細資料	回覆引用被引用(1) TOP

yiyiallall 油雞滷味樣樣都要 Silver Member 帖子 14695 積分 14096 註冊 2008-8-19 發短消息加為好友	#4 發表於 2022-10-30 14:15 只看該作者大中小繁簡引用: 原帖由 big@john 於 2022-10-30 13:17 發表咁有乜方法可避免或清除？我就覺得唔好晒心機搞。好難整得走。
UID 3335487 帖子 14695 精華 0 積分 14096 金幣 1646 閱讀權限 70 來自 [img]http://cdn01.cdn.socialit 在線時間 6242 小時註冊 2008-8-19 最後登錄 2023-6-5 查看詳細資料	回覆引用 TOP

big@john 尊貴會員帖子 2077 積分 1878 註冊 2013-10-18 發短消息加為好友	#5 樓主發表於 2022-10-30 14:16 只看該作者大中小繁簡 [按此打開] [隱藏] 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
UID 5286405 帖子 2077 精華 0 積分 1878 金幣 1329 閱讀權限 50 在線時間 5245 小時註冊 2013-10-18 最後登錄 2023-6-2 查看詳細資料	回覆引用被引用(1) TOP

yiyiallall 油雞滷味樣樣都要 Silver Member 帖子 14695 積分 14096 註冊 2008-8-19 發短消息加為好友	#6 發表於 2022-10-30 14:40 只看該作者大中小繁簡引用: 原帖由 big@john 於 2022-10-30 14:16 發表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。
UID 3335487 帖子 14695 精華 0 積分 14096 金幣 1646 閱讀權限 70 來自 [img]http://cdn01.cdn.socialit 在線時間 6242 小時註冊 2008-8-19 最後登錄 2023-6-5 查看詳細資料	回覆引用 TOP

big@john 尊貴會員帖子 2077 積分 1878 註冊 2013-10-18 發短消息加為好友	#7 樓主發表於 2022-10-30 16:20 只看該作者大中小繁簡想問吓，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？
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CP-KELVIN

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發表於 2022-10-30 16:49

引用:

原帖由 big@john 於 2022-10-30 13:09 發表
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？

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

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

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CP-KELVIN

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發表於 2022-10-30 16:55

Milk Spots on Silver Coins

Author: Lawrence Chard - Director and Expert Numismatist
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.

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.

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:

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 will check if there is any further “official” statement available about that theme from TPM.

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.

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big@john 尊貴會員帖子 2077 積分 1878 註冊 2013-10-18 發短消息加為好友	#10 樓主發表於 2022-10-30 17:02 只看該作者大中小繁簡 [按此打開] [隱藏] 引用: 原帖由 CP-KELVIN 於 2022-10-30 16:55 發表 Milk Spots on Silver Coins Author: Lawrence Chard - Director and Expert Numismatist Published: 19 Aug 2021 L ... Thanks for the information
UID 5286405 帖子 2077 精華 0 積分 1878 金幣 1329 閱讀權限 50 在線時間 5245 小時註冊 2013-10-18 最後登錄 2023-6-2 查看詳細資料	回覆引用 TOP

yiyiallall 油雞滷味樣樣都要 Silver Member 帖子 14695 積分 14096 註冊 2008-8-19 發短消息加為好友	#11 發表於 2022-10-30 18:02 只看該作者大中小繁簡引用: 原帖由 big@john 於 2022-10-30 16:20 發表想問吓，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？ Lpm係有賣過表明係spotted嘅銀幣
UID 3335487 帖子 14695 精華 0 積分 14096 金幣 1646 閱讀權限 70 來自 [img]http://cdn01.cdn.socialit 在線時間 6242 小時註冊 2008-8-19 最後登錄 2023-6-5 查看詳細資料	回覆引用 TOP

yiyiallall

油雞滷味樣樣都要

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#12

發表於 2022-10-30 18:14

引用:

原帖由 CP-KELVIN 於 2022-10-30 16:49 發表

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

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。

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yiyiallall

油雞滷味樣樣都要

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#13

發表於 2022-10-31 09:48

近排入盒精鑄都出事

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EyeonHK VIP 帖子 8604 積分 9093 註冊 2005-8-26 發短消息加為好友	#14 發表於 2022-10-31 10:44 只看該作者大中小繁簡引用: 原帖由 yiyiallall 於 2022-10-31 09:48 發表近排入盒精鑄都出事睇完你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... https://coinhunter.co.uk/50p/silver-proof/coin-toning/
UID 666707 帖子 8604 精華 1 積分 9093 金幣 1978 閱讀權限 60 來自 Hong Kong 在線時間 3279 小時註冊 2005-8-26 最後登錄 2023-6-5 查看詳細資料	回覆引用被引用(1) TOP