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Milk spot

It's a very common problem for RCM coins. It's well known that the spots were not there when you received the coins but develops weeks afterward. It's nothing to do wherever you get the coins. I post them before.

http://yanroyal.blogspot.com/2012/02/nice-milk-spot-hd-movie.html
http://yanroyal.blogspot.com/2012/02/milk-spot-ii.html
http://yanroyal.blogspot.com/2012/02/canadian-wolf-remember-it-is-rcm.html

First, I highly recommend not using a simple transparent film as the sole protective measure, the film is neither air seal nor a reliable shock absorber. In case the coins hit something or drop on the floor, dent will develop. Get a good quality capsule e.g. light house or Airtite. Or the original tubing if you've got 25 maple or philharmonic, 20 eagle.

Second, silver coins must be put inside 防潮盒,櫃.

Third, NEVER use rubber 橡膠擦 or silver cleaning clothes to clean up the spot, otherwise obvious scratch will develop, even more disgusting than the milk spot and is irreversible.  正所謂
無得攪
唔好攪
越攪越衰

Forth, re-define your reasons of buying silver. Don't think that resell the coins in second hand market is an easy thing. For investment, gold is still the best option and the liquidity is higher, on my humble opinion.